Every year there are fewer and fewer wooden frames. The old ones fall into disrepair and dry up and no longer protect against nanodrafts. Homeowners prefer sealed and inexpensive double-glazed windows. But tightness also has a negative side - gas exchange in the room remains at a low level. Micro-ventilation in plastic windows offers a solution to a serious problem. This technology and its varieties, how the device works, how to choose it and how to install it yourself, will be discussed in the article.
Ways to open plastic windows
Plastic windows are a complex system of interacting elements that needs to be properly operated. In order for the windows to serve for more than one year, they must be looked after:
- Inspect and lubricate the movable elements of the window structure;
- Clean drains from contamination;
- Clean and lubricate rubber seals to prevent them from drying out and further cracking;
- Do not wash windows with aggressive chemicals.
However, proper care does not guarantee the exclusion of window breakdowns that arise as a result of improper use. In order to prevent damage to the window mechanisms, it is not recommended:
- Turn the handle when the window is open;
- When opening the window, you should make sure that the sashes fit snugly;
- It is not recommended to pull the handle forcefully;
- Repair work should be carried out with the shutters closed.
Also, for proper operation and in order to avoid mechanical damage, it is necessary to know how to open plastic windows, the various modes and for what purposes they are usually used.
Swivel opening
In this version, the window opens as standard in full width, which allows a large mass of air flow to enter the room. They open inside the room to the right or left - depending on the location of the hinges. Swivel opening is carried out as follows:
- Press the window tightly against the frame and turn the handle 90 degrees to the horizontal position from the “closed” state;
- Open the sash;
- To close, also press the sash firmly against the frame and move the handle to the “closed” position.
Tilt opening
This opening option allows the window to open 45 degrees vertically. Convenient in that the sash is not a source of danger and will not slam shut with force from a gust of wind. It should be opened according to the following scheme:
- Press the window tightly to the frame and turn the handle 180 degrees from the “closed” position;
- Open the sash towards you;
- To close the window, you should also firmly press the sash against the frame and return the handle to the “closed” position.
Slotted "winter" opening / ventilation
This type of ventilation is relevant in winter because the window opens onto a gap and cold air masses enter in small quantities without causing discomfort.
- To open, press the sash firmly against the frame and turn the handle 45 degrees down;
- Open the gap, which will be 10-15 mm;
- To close, also press the sash firmly against the frame and return the handle to its original position.
Types of window ventilators
So, you decided to buy and install ventilation valves on the windows.All these devices work according to the same principle: under the influence of the hood, the outside air enters the gap, enters the room and mixes with the upward flow from the heating radiator. According to the method of installation, the ventilation valves are divided into 2 types:
- Overhead for opening windows. Placed on the sash, a section of the standard rubber seal is cut out for the passage of air.
- Slotted (mortise) for blind and hinged windows. A horizontal through slot is made in the frame for these devices.
Surface-mounted (left) and slotted ventilation valves (right)
Reference. Both types of valves can be installed on various window systems - aluminum, wood, metal-plastic (PVC). The real productivity of slotted products is 15 ... 25 m³ / h; consignment notes - about 10 m³ / h, the price does not exceed 10 euros.
In the basic configuration, the overlay valve on the plastic window consists of the following parts:
- plastic case with a latch-shaped adjustment knob;
- outer windshield;
- a special seal to replace the standard one;
- fasteners.
Air-box dampers can be additionally equipped with a coarse filter of class G3 (80 ... 90%), which simultaneously performs a soundproofing function. Horizontal or vertical installation is allowed, and the visor does not interfere with the installation of a window mosquito net outside.
Built-in slot ventilators consist of the following elements:
- external visor;
- inner casing with grate and flow regulator;
- filter element G3;
- fasteners.
Visors on VENTS valves are equipped with an insect screen, the body is equipped with an adjustable rotary mechanism. It allows not only to regulate the amount of air, but also to direct the flow up / down.
The Aereco brand supply valves are equipped with a special spacer to increase the air flow and a hygro-adjustable device. What it means: a damper is installed inside the case, whose position depends on the humidity in the room. When it increases, the polyamide moisture sensor opens the shutter, letting more air into the room. When the relative humidity drops, the damper closes automatically.
Regulation of the air flow direction in the VENTS damper
Ventilation mode for plastic windows
The tightness of plastic windows is their main advantage and disadvantage at the same time. A closed window leads to stuffiness, fogging and condensation. To avoid this, forced ventilation is used - opening a window in a tilt or tilt mode. When repairs are done, it is worth replacing the windows with plastic ones. If the ventilation mode does not open, you need to call a specialist, and not look for a mechanism in the pictures and repair it yourself at home. With the onset of cold weather, an open wide-open window leads to significant heat loss, therefore, in order to avoid too frequent opening and closing of the shutters, they resort to installing a special ventilation system. Today there are several types of it, and everyone can choose the most suitable one for themselves. Systems used for ventilation:
- window opening stops;
- window ventilation systems.
Sash opening limiters
Devices limiting the opening of the sash will allow organizing the ventilation mode of plastic windows in the autumn-winter period without the risk of overcooling the room and catching a cold. In the tilt opening mode, an external or built-in comb is used. With swing opening, an activated or permanently operating brake is used. The mode of winter ventilation of plastic windows is always in demand, as is the adjustment. It is not recommended to repair it on your own, even when the handle of the plastic windows simply does not turn into ventilation mode.A comb on the outside allows the flap to be fixed in several positions (from two to four) depending on its height. However, not everyone likes the fact that it violates the aesthetics of the window.
A comb, built into the window fittings, makes it possible to fix the sash in four positions, regardless of its height. Not every piece of furniture provides such an opportunity. It is available, for example, in the Winkhaus fittings. It is recommended to install flaps with built-in combs in all rooms, but if this is not possible, then in the bedroom and in the kitchen it is a must.
How to adjust the ventilation mode of plastic windows
Swing opening of window sashes and systems for its regulation are in demand with the onset of the warm season, when the stuffiness in the bedroom can be overcome only by opening the window wide. To prevent the open sash from accidentally closing from a draft with a loud bang, special brake devices are used:
- a permanently acting brake allows the sash to be fixed in the selected intermediate position; the resistance value can be adjusted with a special screw. The sash, which is fixed in this way, closes and opens with great effort. This is both an advantage and a disadvantage of a permanent brake. The disadvantage is that the window is deprived of the usual ease of opening and closing;
- the included one allows you not to exert efforts when opening and closing the sash, but you can fix it in the selected position by turning the handle down. Such a device is more expensive. Recommended for installation on a balcony door.
Window brakes do not affect aesthetics and can be combined with tilt opening adjustment devices.
Window ventilation systems
Depending on the design solution, they are divided into three groups:
- seals with partial air permeability;
- open dampers installed on plastic profiles;
- devices placed at the top or bottom of the frame.
The disadvantage of the first type is the inability to adjust the ventilation intensity.
Cons of the second and third types:
- hypothermia of the channel through which air enters, the possibility of its freezing from the side of the room;
- quite high cost.
They are mainly used in administrative and office buildings. Residential building owners rarely practice the installation of this type of window ventilation system.
Source: otvetclub.com
Reasons for the incorrect position of the sash
First, you should deal with the factors, the occurrence of which leads to such problems. In 90% of cases, the reason for opening the window in two positions at once is the incorrect operation of the fittings. The main harness (tires, scissors, extension cords) is located at the end of the sash. Striking strips that secure the transom are installed on the end of the frame (impost).
Stages of hardware operation at different sash positions:
- Swing opening. When the handle is turned 90 °, the striking plates come out of the fixing of the hooks and the transom opens.
- Airing. The handle moves another 90 °, the lower hook remains in the horizontal striker, providing a stop. The sash tilts to the distance of the upper scissors overhang.
- Micro-ventilation. A special limiter has been added to the design, which allows opening the transom in the ventilation mode by 3-5 mm.
When working in each of these positions, the elements may malfunction.
Advantages and disadvantages
Before delving into the details, it is worth knowing about the advantages of arranging a micro-ventilation mechanism. This makes it possible to understand the importance of having such a system, as well as to better understand the details of its structure.
In winter and autumn
In winter, the cold glass is turned on one side of the room, which leads to the formation of condensation.If it is very cold outside or the glass is single, frost appears. Unpleasant freezing can be removed mechanically, the condensate can be wiped off, but these are short-term options. Frost will reappear soon. It is expensive to use the formulations from freezing and is not beneficial for health, due to the toxicity of individual components.
The way out is to form an air gap between the air masses of the apartment and the glass surface. Microventilation creates this protective area. Cold air is supplied to the room in a quantitative range from 0 to 10-15 m3 / hour. This flow is not enough to affect the overall temperature, but the circulation creates a wind barrier that prevents ice formation. The elimination of dampness on the window prevents damage to decorative coatings and the formation of fungus.
In spring and summer
The use of micro-ventilation maintains a stable and comfortable microclimate and a constant supply of fresh air. This is more profitable than periodically using the window or opening the movable part of the frame. The explanation is simple: the ventilation works continuously, and the window is opened temporarily.
In addition, with the same intake air volumes:
- there are no drafts;
- the humidity level is normalized;
- less dust gets into the room;
- sound insulation is not disturbed.
The last two benefits are especially relevant in cities, as well as in rural areas in houses located close to the road.
There is one more important circumstance. An incompletely open window means a decrease in the light opening and a slight, but a drop in the level of illumination. The frame divides the light flux into two parts, and the glass at an angle more refracts the rays incoming perpendicular to the plane of the window. Any micro-ventilation system is free from this disadvantage.
Operational advantages
From a practical point of view, it is worth highlighting a number of positive points:
- devices have an affordable price;
- microventilation of any type can be bought everywhere;
- the device is arranged extremely simply, there is nothing to break in it;
- the mechanism works for years and requires almost no maintenance;
- installation of microventilation is possible with your own hands;
- an apartment, a house in ventilation mode can be left unattended for a long time.
How to fix the situation
If the window has opened in two positions at once, there is no need to try to resolve the issue by applying physical force. This can damage the window and result in costly repairs. Sometimes the handle does not jam, but turns freely. This indicates a change in the shape of the splines. It is necessary to move the decorative strip at the end, unscrew the screws and check the condition of the pin. If it is unsatisfactory, the handle is replaced with a new one.
After installation, the window should work fine. If this does not happen, you should continue to self-repair.
Erroneous opening blocker
Almost all hardware systems include an erroneous opening blocker. It prevents the handle from moving when the sash is in swing mode or when ventilating. If the transom was opened in two planes at once, the operation of this device will prevent the handle from turning.
To solve this problem, you need to do the following:
- Find the blocker. It is located at the end of the sash, next to the handle and is a bar located at an angle of 30 ° relative to the central bus.
- Move (press) the blocker so that it is in the same plane with the fittings.
- Turn the handle to a horizontal position and close the sash.
- Try the correct operation of the window in several modes.
These actions with a blocker solve problems with incorrect functioning of the sash in 80% of cases.
Adjust the sash position yourself
Sometimes the manufacturer, on purpose or unintentionally, does not install a tamper-evident device on the swing-out transoms.These savings are sometimes expensive for the consumer - therefore, plastic windows must still be chosen correctly. If there is no blocker, then opening in two positions at once occurs often. But the handle does not jam.
Correction of the transom is performed as follows:
- The handle is moved to the "airing" position.
- The sash closes.
- The handle is installed in swing mode.
- The correct functioning of the fittings is checked.
After these steps, the problem should be resolved.
Scissor problems
With prolonged use, the position of the sash will gradually change. This can lead to the fact that the clamping eccentric of the upper scissors will not be in the same plane with the striker. And then the sash can move in two planes at once - horizontal and vertical.
For work, you need an L-shaped hexagon.
Procedure for correcting the situation:
- Adjust the transom. This is done using the functionality of the lower loop, on which there are special grooves.
- In addition, restore the position of the eccentric with a hexagon. The sash opens, the tool fits into the groove and scrolls.
- Checking the functionality of the sash in various positions.
In rare cases, the work of the fittings is impossible due to the breakdown of the moving guides located inside. Then the only solution to the problem is to call the master for professional dismantling of the sash and replace the faulty fittings.
Source: masterim.guru
Plastic windows with ventilation: 4 ways to deliver fresh air to the room
Unimpeded access of fresh air to the premises is extremely important!
Probably, many of us have come across a situation when the plastic window does not close from the ventilation mode, or the ventilation does not take place with the intensity that we need. In general, the issue of providing ventilation in the room where plastic windows are installed is quite interesting and extensive.
Therefore, here I will share the most important information that will be useful not only for craftsmen, but also for ordinary owners of PVC structures.
Requirements for air substitution (ventilation)
In the Sanitary and Epidemiological Requirements for Residential Buildings and Premises, as well as construction standards (SanPiN 2.1.2.1002-00, SNiP 2.04.05-91, SNiP 2.08.02-89, SNiP 31-01-2003, etc.), as well as European standards (for example, DIN 1946-2, DIN 1947-6) - requirements for air exchange are fixed.
Air exchange standardized for various types of premises
According to SNiP 2.08.02-89, SNiP 31-01-2003
| Premises | Air exchange, m3 / hour, not less |
| Bedroom, common, children's room | 0,2-1,0 |
| Kitchen with electric stove | 0,5-60,0 |
| Kindergarten rooms | 2,5 |
| School classes | 16.0 per person |
| Wards for adult patients | 80.0 per bed |
Ventilation helps to normalize the level of carbon dioxide and other impurities in the room air by replacing it with fresh air. One of the main requirements for properly working ventilation is the serviceability of the house ventilation system (ventilation house mine).
Ventilation methods
Method 1. Standard ventilation
So, if you have a plastic window installed, then the easiest way to ventilate the room is to open the sash. Modern PVC structures have two opening modes:
- pivoting - the sash completely opens the opening, turning on both hinges;
- flap - the sash tilts into the room. In this case, the upper corner comes out of the hinge and is held by a special piece of fittings.
Classification of windows by type of sash opening
In fact, the sash can also move up or to the side, but such systems are almost never found in our country. This is due to the fact that the sliding mechanism cannot provide sufficient tightness and pressing the sash to the frame, therefore the heat loss through such a window will be very large. In general, the climate is not favorable.
Hinged sash opening
With a rotary opening, the air exchange is very intensive, therefore it is used mainly for "volley ventilation". Usually, however, they are limited to the folding mode:
- The sash is installed in the closed position.
- We turn the handle up and at the same time pull it towards ourselves.
- The sash tilts, creating a wide enough gap through which fresh air enters the room.
It should be noted that not all windows have the ability to set the sash in the tilting position - a separate piece of hardware is responsible for its implementation, which is placed in the upper part of the strapping.
That is why it is better to think in advance whether you need this function: in principle, it is possible to remake a plastic window for ventilation, but this is associated with additional costs, and you are unlikely to cope with this task on your own.
Source: obustroeno.com
Window manufacturers with integrated micro-ventilation
Windows with this useful function are produced by all major companies in the industry. Even inexpensive models have built-in micro-ventilation. If you plan to replace old cracked wooden frames, it is best to purchase windows that include these convenient indoor climate control mechanisms.
Products with microventilation are guaranteed to be found in the assortment of such companies as:
- Proplex;
- Trocal;
- Veka;
- Rehau;
- KBE;
- Kaleva;
- Krauss;
- Montblanc;
- Deceuninck;
- Plafen;
- Salamander;
- WDS.
Russian or Panorama are not lagging behind either. A positive feature of domestically produced goods can be called reasonable prices, with decent quality.
Types of opening windows
Today it is difficult to imagine a house without windows, although there are examples in the world that are devoid of this familiar architectural detail. There are also dwellings whose owners, due to an unfortunate neighborhood, decided not to install windows in the usual direction, preferring to install several dozen rooflights made of matte acrylic. A striking example of this is the concrete house in Hiroshima. Personally, I cannot imagine a cozy home without high-quality daylight and a stream of fresh air, and our need for this is perfectly satisfied by the windows. They can be made of wood or plastic, have a wide variety of shapes and open in different directions. Today we will talk about what kind of windows exist in the direction of opening.
Sash opening methods
As a rule, in multi-storey buildings, the same type of metal-plastic windows are installed in white, which can be opened towards yourself (swing flap) or upward (flap). Very often half of the window does not open at all, this is called a "blind sash".
In fact, there are many more ways to open the sash, and some of them are very convenient and are more actively used in private households. Below is a description of each method + a visual opening diagram.
1. Blind flap. Such a sash is not openable. As a rule, such sashes are installed in shop windows, in combined window systems, when some sash opens and some does not. Such a sash complicates the process of cleaning the outside of the window and does not allow airing the room.
2. Rotary way of opening the sash (swing sash). Such windows can open inward or outward. This is a fairly common type of opening windows. One side of such a window is hinged. To open the window, you need to pull the handle, after which it will open with a rotation around the fixed axis. The cost of such windows is quite low, and they are quite in demand in the modern window market.
3. Flap way of opening the flaps (flap). The above-described method of opening the sash is very often combined with a hinged one, since this allows, depending on the owner's desire, to open the window in the mode of light ventilation upward or wide open.Window manufacturers provide the ability to turn the handle in different directions for one direction or another of the opening. Swivel opening - handle in horizontal position, folding - in vertical position. I would like to say that in cheap windows, the sashes very often jam when turning the handles, which I had to face when renting an apartment in a new building. It is better to choose a more durable and high quality option, like on oknawam.ru.
4. Suspended sash opening method (suspended sash). In this case, the sash opens at the bottom of the window. It is very important that such a window is also made with high quality, since the risk of pinching your fingers is quite high.
5. The way of opening the flaps, rotatable along the vertical axis (swinging on the vertical axis, the flap). Such a window can be opened to the right or left side, while part of the window goes out, and the other - into the apartment. This type of sash cannot be called the most popular, as it is not very convenient.
6. A way of opening the flaps that can be rotated along the horizontal axis (a swinging flap along the horizontal axis). Everything is similar to method number five, only the window opens up and down, not to the side.
7. Sliding way of opening the sash (sliding sash). A very convenient way, since you can open the window to any width and it is safer if you have a cat in your house. Few people know that opening a window to the overhead ventilation is potentially dangerous for cats, as they try to get out, slide down and break backs (there are thousands of reported cases in the world). Plastic windows are slippery, animals have nothing to cling to with their claws.
8. Folding way of opening the sash (folding sash). In this case, the window can be easily folded like an accordion. Such windows look quite original, and with proper design, you can create a very beautiful window composition.
Source: prostoloca.ru
Modes in metal-plastic windows
Plastic modern windows allow for ventilation in the room in various ways.
To organize the natural exchange of air and establish effective ventilation, it is now possible to move the sash to one of the positions for micro ventilation.
It is easy to set the ventilation mode for plastic windows: you need to pull up the handle, and, pointing towards yourself, deflect the sash to the required distance. If you turn the window handle at an angle of 45 °, you get a small slot for micro-ventilation. This mode restricts the air flow, creating a minimum opening, literally a couple of millimeters. This effect can be achieved by turning the window handle from vertical position to the side by 45 °.
You can arrange ventilation without opening the sash itself, if you slightly change the design of the profile and add a special ventilation valve. Such a mechanism is provided by the window package and can be installed directly during the installation of windows. Additional ventilation is easy by opening and closing the valve.
How to adjust micro ventilation
There are several ways to regulate micro-ventilation in an apartment. With their help, you do not have to worry about how to ventilate your home.
- comb;
- micro-crevice ventilation;
- micro-ventilation valve for plastic windows.
Comb
A comb or opening stop is the most inexpensive way to ensure the flow of fresh air into the apartment and not open the sash wide open.
The stopper is a comb-like bar and tongue. The bar (metal or plastic) is attached to the frame. A tongue is installed under the sash handle. Open the window, lock the tongue in the comb, and you get oxygen flow.
You can start installing the comb yourself or use the services of specialists.The advantages of this method include budget and ease of installation.
But there are also disadvantages: during installation, the tightness may be broken. In addition, it is possible to reduce the properties of heat and sound insulation of the system.
Microslit ventilation
There are mechanisms in the casement that allow it to be fixed in different positions. Such fittings are installed during production.
There is a possibility of setting the micro-ventilation mode to a ready-made window. To do this, you need to contact an organization that will perform all the necessary work.
This mode has a number of undeniable advantages:
- the room is freed from unpleasant odors and harmful substances;
- fresh air enters the apartment constantly;
- glasses do not "cry";
- excess moisture evaporates from the room;
- unpleasant drafts are excluded;
- precipitation, wind, insects and dust do not fly into the room;
- a comfortable temperature remains, the room does not cool down in winter, does not overheat in summer;
- with micro-ventilation, the integrity of the system is not violated, anti-burglary properties are preserved.
Micro ventilation valve
Another great way to provide micro-ventilation in a room is to install a valve for plastic windows.
By installing a ventilation valve for plastic windows, it is possible to provide micro-ventilation in the room
The main plus of the valve is that the integrity of the glass unit is not violated and the tightness is maintained. And the climate control in the room is carried out constantly.
Why doesn't the PVC window close after airing?
Sometimes it is not possible to close the sash the first time. Possible reasons for this are easy to find by examining the condition of the metal-plastic profile, and then eliminate the malfunction. As a rule, a single malfunction is not a reason to replace a window. It is worth taking a closer look at the PVC product, and small repairs will not require significant money or time.
Potential reasons why the window "froze" when ventilated:
If, during operation, the mechanism that sets the sash in motion gave even an insignificant "shake", it can cling to the window frame with its edges. The device that adjusts the position of the "window" is capable of loosening both vertically and horizontally.
Switching to the "2 in 1" mode
Normal level of humidity in living quarters
According to SanPiN 2.1.2.1002-00, a relative humidity level of 30-65% at a temperature of 18-28 degrees is considered acceptable for residential premises. Celsius.
According to the building regulations - SP 50.13330.2012 "Thermal protection of buildings" - normal room humidity will be:
| Temperature | Humidity |
| less than 12 0C | 60-75% |
| 12 -24 0C | 50-60% |
| over 24 0C | 40-50% |
Ways to solve the problem of closing the window
To bring the sash into working condition, it is necessary to carry out simple manipulations to eliminate the cause of the wedge. This does not require special skills and sophisticated tools. Prepare a 4mm Allen key and regular pliers, this should be sufficient. Let's get started?
Eliminate the skew
Adjustment vertically or horizontally will help to remove the skew of the PVC window. Screws are designed to return the mechanism to one plane, which are easy to find from the inside of the profile. It is necessary to get to the side and bottom screws hidden on the hinges under the special caps.
After removing the decorative plugs, the position of the sash is calibrated with a hexagon. In this case, the lower screw is responsible for the alignment along the "top-bottom" axis, and the side screw is responsible for the "right-left". When you are finished adjusting the system, close and then open the window. Repeat a few times to see if the issue is resolved.
Dual mode
When you try to abruptly transfer the window from one mode to another, the corner may fly off. At the same time, the sash seems to "freeze", it appears simultaneously in two modes, the order of adhesion to the frame is violated. The failure can be eliminated by pressing the upper corner and the lock to the frame, and at the same time set the sash handle to "open".After returning to its normal position, the window closes easily.
Not snug fit
It all depends on the reason for the loose fit. If the elasticity of the insulation is lost, there are tears and damage on it, then replacement is necessary. The worn-out seal will not return its properties, it remains only to throw it away.
Incorrectly adjusted eccentrics create the same problem. It is known that the eccentric has two operating modes - winter and summer. The mechanism adjusts the pressure level, while the winter position is slightly stronger.
Please note that these names are conditional; it is not necessary to transfer the eccentric to the appropriate season for the ventilation of PVC windows. If no noticeable cracks, drafts or other tangible problems have occurred since the installation of window structures, you should not change the position of the marker.
But if the reason is in it, you can change the marker values using a hexagon. The marker of a metal-plastic window, exposed to the side of the street, means "winter". When warm, the polarity should be reversed.
Drainage frame out of place
There is a drainage hole in the window unit for draining water. If the frame has come off, you must return it to its original position. Before this, you will need to thoroughly clean the entire frame perimeter.
Deformation of the window profile due to shrinkage
Sagging is almost impossible to eliminate on your own. Contact the service department with a request to reinstall the structure. As a rule, the manufacturing company provides a guarantee for window products and work performed on their installation.
True, if the window is irreversibly deformed, you will have to buy a new one. The problem is typical for new buildings, where the walls were recently erected and the house has not yet fully passed the shrinkage stage. Only after the completion of the movement of the walls, you can proceed to the re-installation of PVC windows.
Jammed window handle
If the handle is wedged, it is required to dismantle the sash. After removing the protective cap from the upper hinge, try to knock out the pin from above. After that, the "scissors" part is returned to the groove, and the sash is hooked back. In rare cases, when slopes do not prevent this, it is possible to get to the mechanism even without removing the sash from the hinge.
How to easily adjust the micro ventilation mode
The micro-ventilation function is built into most modern profiles. To enable this mode, the window sash by turning the handle is displaced a tiny distance, creating a small "corridor" for the flow of fresh air from the street. You can also achieve a draft-free ventilation effect using special fittings.
We use a comb
Adjusting comfortable air exchange with a comb allows you to bring the window sash to the position with the required slope. The limiter sets the angle to 60, 45 or 30 °.
Plastic fittings regulate the ventilation mode by setting the window to the required level. A hook is fixed on the frame, which in different positions limits the angle of inclination of the sash. The comb is attached to the window frame and has recesses on it. When the hook moves from one groove to another, the frame changes the angle.
