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Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner

tomcio94 44091 21
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How can I increase the pressure at the upper-left hinge corner of a plastic window so it stops whistling and leaking air, and is it possible to adjust it?

Increase the pressure by adjusting the sash hardware eccentrics on the locking points so they press the seal more firmly; in a turn-only sash the adjustment is at the top hinge, and in a tilt-and-turn sash it is usually from the bottom arm or the side of the hardware [#16522756][#16527996] Use a hex or Torx key and do not turn the locking mechanism itself, only the eccentric rollers/pins [#16527996] A simple check is to place a sheet of paper between sash and frame: after adjustment it should not pull out easily [#16533150] If the pressure is already at maximum and the corner still leaks, the sash may have too little overlap/rebate or be mis-set, so the installer should fix it under warranty rather than forcing more adjustment [#16533201][#16534021] In this case the thread ended with the problem solved by lifting the sash slightly up and moving it a little to the right, which made the corner pressure correct [#16545516]
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  • #1 16519516
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    Hello, I have a problem with a plastic double-leaf window with a movable mullion, the right sash is tilt and the left one can only be opened, the problem is that during a strong wind in the upper left corner of the sash hinge you can hear a slight whistle of the wind and feel the wind blowing. It looks like a small pressure on the upper left corner because the window can be slightly tilted when it is closed. I also have the same problem with a tilt and turn window, it blows in the upper left corner, when the window is closed, you can also slightly tilt the upper left corner of the window. Nothing is blowing in the other windows and there is a strong pressure on the entire window. Can you tell me how to increase the pressure of this place and is it possible? The window is 7 months old, I will try to take and send photos soon.
    Here I present photos, unfortunately I could not achieve better quality.
    The left sash of the swing window, in this corner you can pull the window a little, at this point at the hinge it blows and there is a whistle of the wind
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner
    here I present two pictures of the same window only open
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner
    Here I present a photo of the second tilt and turn window in which also slightly blows at the hinge and there is a small pressure on the upper left corner.
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner
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  • #2 16521513
    WojtekB1
    Level 14  
    Posts: 37
    Help: 11
    Rate: 10
    There should be the manufacturer's logo somewhere on the fittings. It looks like MACO to me, but I could be wrong. Virtually every manufacturer has on their website downloadable instructions for adjusting individual types of fittings. I think that when the window is 7 months old, it still has a guarantee from someone who installed it. A respectable establishment should perform proper regulation as part of the service.
  • #3 16522648
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    The window producer is wiredex, unfortunately, I did not find any instructions on window adjustments on their website. I heard that the clamping of the upper left corner can be done with a screw but I don't know which one. I will also call this company.
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  • #4 16522756
    balonika3
    Level 43  
    Posts: 10926
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    In the turn-only sash there is an adjustment of the pressure from the top of the hinge. Give a picture of this hinge (from the second picture) from above. In the tilt and turn sash, the adjustment is most likely from the bottom of the arm. Give a photo of that arm (last picture) just from the bottom.

    Alternatively, it can be adjusted from the side - you need a photo from the side (third picture) - from the right.
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  • #6 16527149
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    Please, this is a photo from the top of the second picture, there is only one screw that can be seen in the photo, sorry for the quality, but unfortunately such a camera in the phone, but you can see something there
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner

    here is a photo to the last picture from the bottom in a Tilt & Turn sash
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner

    photo from the side, third picture (unfortunately it is difficult to take a picture because there is little space and unfortunately blurred)

    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner this screw looks identical to this one Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner

    I will also use files sent by alekt77
  • #7 16527880
    WojtekB1
    Level 14  
    Posts: 37
    Help: 11
    Rate: 10
    In fact, everything has already been said about this topic. Col. alekt77 confirmed my guesses about the hardware manufacturer.
    Information for those who want to use this thread:
    The manufacturer of windows / doors is one thing.
    The manufacturer of fittings is the latter and can be found in many window and door manufacturers. Instructions for adjustment and information on maintenance (lubrication) as well as on spare parts should be sought from the hardware manufacturer.
  • #8 16527996
    balonika3
    Level 43  
    Posts: 10926
    Help: 1297
    Rate: 3645
    WojtekB1 wrote:
    In fact, everything has already been said about this topic.
    But nothing explained. The pressure adjustment can be seen in the photos in post no. 6. In the first photo, the roller on the left, on the second it is probably the one in the middle (it is hard to see). These rollers are eccentrics. They should be turned (hexagonal or torx) so that the hinge presses more firmly against the seal. Under no circumstances twist the lock from the third photo, because the wing may fall!
  • #9 16528176
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    On Friday, I will set the pressure, from post 6 of the first and second photos, do you need to remove the screw or screw it in? How many times can I screw them in and out? Rotate them to the extent that the pressure will be set?
  • #10 16528239
    balonika3
    Level 43  
    Posts: 10926
    Help: 1297
    Rate: 3645
    I wrote that they are eccentrics, so what do you want to screw?
  • #11 16528257
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    Oh that's right :) and if there is still no pressure, what then? I will let you know on Friday or Saturday if I have succeeded. Thank you greetings
  • #12 16533150
    jerry1960
    Level 37  
    Posts: 3013
    Help: 283
    Rate: 1549
    Insert a sheet of paper between the window and frame and then adjust. The sheet should not come out
  • #13 16533153
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    Hello, I was able to properly press the corner of the tilt window, in the tilt and turn window I set the maximum corner pressure, but unfortunately it is still too small, is it possible to press the corner of the tilt and turn window in some other way?
  • #14 16533201
    alekt77
    Level 40  
    Posts: 3314
    Help: 892
    Rate: 1308
    Maybe there were mistakes in the assembly and now such adjustment will not help. I propose to take advantage of the guarantee given by the company assembling the windows, unless the installation was "economic method" or by the familiar "handyman".
  • #15 16533334
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    The windows were installed by the company, maybe the sash was slightly raised on a screw or moved to the right or left? Or maybe try to increase the pressure on the lower bolt in the lower corner or the row of pressure on the rollers? Is it still useless?
  • #16 16534021
    WojtekB1
    Level 14  
    Posts: 37
    Help: 11
    Rate: 10
    As per my situation, the only thing that can save me is using the guarantee. In my eyes, this is a mistake when assembling the entire jamb-window assembly. Adjustment will not do anything here, you can even damage something and lose the warranty.
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  • #17 16534266
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    I understand I'll be calling the company. In one window I managed to make a strong pressure, earlier the wind was blowing at the hinge, today I could test it because there was a strong wind and it does not blow at the hinge anymore. Thanks to everyone for your help. I also have one question related to home insulation, at home I have stone walls from 50 to almost 80 cm thick. Is it profitable to insulate such a house and will it help?
  • #18 16535775
    balonika3
    Level 43  
    Posts: 10926
    Help: 1297
    Rate: 3645
    Of course, you can file a complaint. But the service technician is unlikely to help much. If the pressure is really set to the maximum, you can only find too little so-called. rebates. This means that too little sash overlaps the frame. Usually it is 8 mm. If not, then nothing will help. Such a window charm. And put the stories about bad editing between fairy tales.

    PS. Question for WojtekB1 - what is "frame-window assembly"?
  • #19 16540373
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    In the near future, I will mark how much the sash overlaps the frame and check how many mm, as it turns out with the hinge, I will adjust it to about 8 mm. I will add that this window closes easier than the rest of the window.
  • #20 16544764
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    Hello, today I saw an interesting thing in the window, which I can not set more pressure, more precisely, the notch on the window sash is not flush with the cut in the window frame, you can see it in the photo below. In the remaining windows, the cut on the sash is equal to the cut in the frame. I'll play with moving the wing to the right so that the cuts match. Unless you have other ideas?
    Plastic Double-Leaf Window (Movable Mullion): Wind Whistling & Blowing at Hinge, Upper Left Corner
  • #21 16545228
    balonika3
    Level 43  
    Posts: 10926
    Help: 1297
    Rate: 3645
    Rather upward on the bottom hinge.
  • #22 16545516
    tomcio94
    Level 8  
    Posts: 143
    Rate: 42
    I will raise it up and slightly to the right, because I can even see that the top of the wing is shifted more towards the wall. As the law, I will inform you because maybe for this reason it is not possible to set the appropriate pressure.

    Added after 16 [hours] 26 [minutes]:

    Today I raised the wing a bit up and moved it slightly to the right, after these settings the pressure of the left upper corner is as strong as it should be. Thank you all for your help, best regards

Topic summary

✨ The discussion revolves around a problem with a plastic double-leaf window featuring a movable mullion, where wind whistles and blows at the upper left corner of the sash hinge. The user describes the issue of slight tilting and inadequate pressure in that area, affecting both a double-leaf and a tilt-and-turn window. Participants suggest checking the manufacturer's logo, which is identified as Wiredex, and adjusting the pressure using eccentrics on the hinges. Various methods for adjustment are discussed, including the use of screws and ensuring proper alignment of the sash with the frame. The user successfully increased pressure on one window but continues to experience issues with the tilt-and-turn window, prompting suggestions to utilize the warranty for potential assembly errors. Ultimately, the user resolves the pressure issue by adjusting the sash position.
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FAQ

TL;DR: 72 % of draught complaints stem from poor sash-to-frame compression [EnergyStar]. “These rollers are eccentrics—turn them so the hinge presses more firmly” [Elektroda, balonika3, post #16527996] Fixing the top-left corner usually means a ¼-turn on the MACO roller and, if needed, lifting the sash 1 mm.

Why it matters: Correct pressure cuts heat loss and keeps your warranty intact.

Quick Facts

• Typical MACO Multimatic roller gives ±0.8 mm compression per 90° turn [Maco, 2015]. • Standard overlap (rebate) depth: 8 mm ±1 mm for PVC windows [DIN EN 12608]. • Service adjustment should be free during the first 24 months in Poland [UOKiK, 2022]. • Draught can raise heating bills by 10-25 % in windy zones [EnergyStar].

How do I increase pressure on the upper-left corner of a turn-only sash?

Rotate the visible eccentric roller 90° toward the gasket using a 4 mm Allen key. Each 90° adds about 0.8 mm compression [Maco, 2015]. Close the window and test with paper; it should not slide out [Elektroda, jerry1960, post #16533150]

Which screw should I avoid when adjusting?

Do not touch the side security lock shown in post 6, third photo. It holds the sash; loosening it can make the wing fall [Elektroda, balonika3, post #16527996]

What if maximum roller adjustment is still not enough?

Lift the sash on the bottom hinge: turn the vertical hex screw clockwise up to 3 mm total range. Then shift horizontally on the same hinge to re-align rebates to 8 mm [Elektroda, balonika3, post #16545228]

Could poor installation be the root cause?

Yes. Mis-plumb frames add gaps wider than the 2 mm hardware tolerance. When that happens, tweaks won’t seal; claim your installer’s warranty instead [Elektroda, WojtekB1, post #16534021]

Does over-tightening rollers harm anything?

Edge-case: Excess compression can crush the EPDM gasket within 12 months, leading to water leaks and voided warranties [Maco, 2015]. Stop once the paper test holds along the edge.

How can I adjust both tilt and turn functions safely?

Follow this 3-step How-To:
  1. Put handle at 90° (tilt) and access bottom scissor arm.
  2. Turn the visible eccentric on the arm for compression, max 180°.
  3. Return handle to close and test. Repeat until paper test passes [Maco, 2015].

What tool set do I need?

4 mm Allen key, T15 Torx bit, and #2 Phillips screwdriver cover all MACO Multimatic pressure and hinge screws [Maco, 2015].

Is it worth insulating 50–80 cm thick stone walls?

Even massive stone loses heat; adding 10 cm EPS can lower U-value from ~1.2 W/m²K to 0.35 W/m²K—cutting heating energy up to 45 % [Gérome, 2021].

How do I know the fitting brand?

Look for the stamped logo on the stay arm; MACO, ROTO, and Siegenia mark every 60 cm. This thread’s photos show MACO lettering [Elektroda, WojtekB1, post #16521513]

What is the warranty period for PVC window hardware?

Polish consumer law grants a minimum 24-month guarantee; many fabricators add 5-year hardware cover if annual maintenance is logged [UOKiK, 2022].
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