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Kair Round Pipe Connector with Backdraught Shutter – Non-Return Damper Flap
SKU: DUCVKC303 QS Code: QS256 
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| Dimensions (mm) | WHL 569696 |
|---|---|
| Temperature (°C) | MinMax -1560 |
| Pressure Loss | 15 l/s30 l/s60 l/s 2544.9101.6 |
| Spigot Size (mm) | 99 |
| Material | ABS Plastic |
| Colour | White |
| View All Technical Details | |
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KAIR SYSTEM ROUND CONNECTOR WITH BACKDRAUGHT SHUTTER / DAMPER
- Inline back draught ducting damper/shutter for 100mm round ducting system.
- Use when you need to stop smells flowing backwards within the ductwork.
- Use when you have two or more extractor fans connected to same ductwork.
PLEASE SEE DIMENSIONS BEFORE YOU PLACE AN ORDER
21 reviews for Kair Round Pipe Connector with Backdraught Shutter – Non-Return Damper Flap
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Questions and answers of the customers
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We’re is best place to fit this
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A Hi Ray. Ideally between 2 pieces of ducting that goes through the wall cavity. That way you have plenty of wind protection.Kind regards, Marc.
Hi Just purchased above item. I have read Q&A but still a bit confused best position. Shower fan in ceiling so duct vertical then horizontal. Could you tell me best position. Thanks
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QHi Just purchased above item. I have read Q&A but still a bit confused best position. Shower fan in ceiling so duct vertical then horizontal. Could you tell me best position. Thanksanswer nowA Hi Steve.The best place to position it would be close to the exit point as it is designed to prevent backdraught whistling up (or down) the duct run.Kind regards, Marc
does it matter which way round the damper goes? If yes, then which way should it go?
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A Hello VeerThank you for your question. This item needs to be installed horizontally within the duct run so that the damper is in the closed position and only opens when the fan is operating.Kind RegardsAnita
Several previous questions relate to this issue but Im not convinced by the answers. I am installing two fans that will vent through a joint vertical pipe that exits through the roof (near to vertical). The damper flap will therefore rest in the horizontal position on the lip and some force appears to be required to push it open from this position. There are limited options for creating a horizontal run without inserting some right angles, reducing air flow. I want to use a backdraught shutter on both fans, one of which is a trickle fan. Can you assure me that the flap will open sufficiently if installed in a horizontal position within a vertical pipe, on the low flow of air pushed up by the trickle fan.
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QSeveral previous questions relate to this issue but Im not convinced by the answers. I am installing two fans that will vent through a joint vertical pipe that exits through the roof (near to vertical). The damper flap will therefore rest in the horizontal position on the lip and some force appears to be required to push it open from this position. There are limited options for creating a horizontal run without inserting some right angles, reducing air flow. I want to use a backdraught shutter on both fans, one of which is a trickle fan. Can you assure me that the flap will open sufficiently if installed in a horizontal position within a...... Read moreanswer nowA Hello KarenThank you for your question. Please give me a call on 0208 463 9683 and I will be happy to talk through your installationKind RegardsAnita
Hi, can this back draft damper withstand 1200pa
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A Hello RadwanThank you for your question. At 120l/s this item is 102.00pa. The data can be found in the gallery for this item on our website.Kind RegardsAnita
Hullo. Please could you tell me if I could use DUCVKC303 (with a short section of 100mm pipe) to effectively lengthen the male section of a standard 100mm ceiling extraction fan? I need to connect a fan (not yet purchased) to an existing flexible hose (presumably 102mm) which has tears in the first 50mm, so an extended connection length might allow me to bypass this and achieve a reasonable seal, as well as have the benefit of the backdraft shutter. Hope this makes sense! Thanks very much for any advice you can offer; Im ready to order the necessary items from you.
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QHullo. Please could you tell me if I could use DUCVKC303 (with a short section of 100mm pipe) to effectively lengthen the male section of a standard 100mm ceiling extraction fan? I need to connect a fan (not yet purchased) to an existing flexible hose (presumably 102mm) which has tears in the first 50mm, so an extended connection length might allow me to bypass this and achieve a reasonable seal, as well as have the benefit of the backdraft shutter. Hope this makes sense! Thanks very much for any advice you can offer; Im ready to order the necessary items from you.answer nowA Hello AnthonyIf you look at the small pictures below the main picture you will see it being inserted into a straight pipe, the total length of the item is shown as 58mm with the central raised band at 2mm this should give a fixing for the flexible duct of 28mmThe short section of pipe is QS193
Hi, I bought this to fit vertically in pipework above my kitchen extractor fan. The purpose to blow open when the fan is on and then as Ive read the flap then falls closed by gravity once the fan stops to stop any back smells coming through if you are connected to another system which I am. This vertical pipe runs into a horizontal tee piece. One end going to the outside and the other is an extractor in another room. My concern is that the flap doesnt seen to close with gravity. Even if I hold it in my hand and push the flap up it wont fall back into place. My worry is its not going to do the job I bought it for. Let me know what you think please
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QHi, I bought this to fit vertically in pipework above my kitchen extractor fan. The purpose to blow open when the fan is on and then as Ive read the flap then falls closed by gravity once the fan stops to stop any back smells coming through if you are connected to another system which I am. This vertical pipe runs into a horizontal tee piece. One end going to the outside and the other is an extractor in another room. My concern is that the flap doesnt seen to close with gravity. Even if I hold it in my hand and push the flap up it wont fall back into place. My worry is its not going to do the job I bought it for. Let me know what you thin...... Read moreanswer nowA Hello GordonThis one is not really designed to be installed in a vertical duct as when the spigot is opened it becomes balanced and there is no weight to make it fall back into place. For your requirements we would suggest the Manrose 1231 which has a hairspring close mechanism, this can be found by entering QS18115 in the quick search bar.
I have a Vent-axia system where the shutters connected to the fan wont open now. If I break off the shutters on the fan would I be able to install your product near the fan to act as a new shutter?
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QI have a Vent-axia system where the shutters connected to the fan wont open now. If I break off the shutters on the fan would I be able to install your product near the fan to act as a new shutter?answer nowA Hello ColinUnfortunately there is not enough information to provide an answer.The product you reference is a duct damper.Is it an in-line or ducted fan?Automatic louvres are usually a feature of through the wall or window fans?Do you know the model number?Its possible DUCVKC292 may be more suitable.
Can this damper be reversed and used to prevent ingress of air until an adjacent kitchen extractor is turned on and then allowing air supply?
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QCan this damper be reversed and used to prevent ingress of air until an adjacent kitchen extractor is turned on and then allowing air supply?answer nowA Hello TerryThis is a gravity damper that is designed to be installed in an exhaust duct and remain closed until such time that it is opened by passing extract air from a kitchen or bathroom fan, as soon as air stops passing over the spigot it just falls back into place, please bear in mind it is a one way only valve.
Does it matter which direction it is fitted?
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A Hello Steve Thank you for your question. This connector with damper can be fitted horizontally and vertically. Kind Regards Anita
I have handled these products before and know how delicate the gravity hinged-flaps can be. Answer 2 states cannot be used in vertical run. Does this not apply to downward pumped flow only? My duct flows upwards to a pitched roof outlet. From memory, the shutter would fall shut, even better than in the horizontal position. Am I right please? Alternatively can you recommend a sprung-shutter type of the same outside diameter? Thank you.
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QI have handled these products before and know how delicate the gravity hinged-flaps can be. Answer 2 states cannot be used in vertical run. Does this not apply to downward pumped flow only? My duct flows upwards to a pitched roof outlet. From memory, the shutter would fall shut, even better than in the horizontal position. Am I right please? Alternatively can you recommend a sprung-shutter type of the same outside diameter? Thank you.answer nowA Hello Gordon Thank you for your question. The backdraught shutter design has now been updated so this product can now be fitted vertically where as before the shutter would stay open on a vertical install. If I can help any further please do not hesitate to contact me Kind Regards Anita
We are fitting a new cooker extractor & the ducting has to go up into the roof space and out through a tile vent. Can this product be used horizontally and vertically? And does it close on its own when the fan is not on?
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QWe are fitting a new cooker extractor & the ducting has to go up into the roof space and out through a tile vent. Can this product be used horizontally and vertically? And does it close on its own when the fan is not on?answer nowA Hello Terry Thank you for your question. Yes the back draught shutter can be fitted horizontally & vertically and it closes when the fan is not in use. If I can help any further please do not hesitate to contact me on 0208 463 9683 Kind Regards Anita
We are fitting a new cooker extractor & the ducting has to go up into the roof space and out through a tile vent. Can this product be used horizontally and vertically? And does it close on its own when the fan is not on?
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QWe are fitting a new cooker extractor & the ducting has to go up into the roof space and out through a tile vent. Can this product be used horizontally and vertically? And does it close on its own when the fan is not on?answer nowA Hello Thank you for your question. Yes the back draught shutter can be fitted horizontally & vertically and it closes when the fan is not in use. If I can help any further please do not hesitate to contact me on 0208 463 9683 Kind Regards Anita
We have an extractor fan going straight through the kitchen wall. When it is windy it whistles through making a loud howling noise. Will this stop it and will the fan be strong enough to open it.
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QWe have an extractor fan going straight through the kitchen wall. When it is windy it whistles through making a loud howling noise. Will this stop it and will the fan be strong enough to open it.answer nowA Hello JohnThe product you have selected is designed to be installed within the duct which may be difficult.It sounds like the outside vent is open to free air and prevailing winds so I would suggest a Cowled wall outlet.To view the product type QS6170 into the search bar.I have selected the same duct size as you but you may want to check what size the duct is at the outlet.I hope this helps.Ian
Hi,
I have installed a 3m run of 125mm round ducting for a cooker hood. This has been terminated with a cowl and damper, but the wind runs across the damper making it open quite often, letting in draughts and street noise.
Can this connector/ damper be used and will it work in the vertical position close to the extract unit where it can be accessed for cleaning purposes?
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QHi, I have installed a 3m run of 125mm round ducting for a cooker hood. This has been terminated with a cowl and damper, but the wind runs across the damper making it open quite often, letting in draughts and street noise. Can this connector/ damper be used and will it work in the vertical position close to the extract unit where it can be accessed for cleaning purposes?answer nowA Hello Garry Thank you for your question. Yes this damper can be fitted in an vertical position. Kind Regards Anita
I have a 125mm/6 extractor fan ducted out through the outer wall - Are you going to or plan to supply this product for a 6 duct. All the kitchen fans I have used are 6 this would be great if you did
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QI have a 125mm/6 extractor fan ducted out through the outer wall - Are you going to or plan to supply this product for a 6 duct. All the kitchen fans I have used are 6 this would be great if you didanswer nowA Hello Simon Thank you for your question. We do supply this item the product code for this item is QS282 this is a 6 backdraught shutter you stated 125mm which is 5 we also do a backdraught shutter in this size the product code for this item is QS269.
We have a Siemens kitchen canopy connected to a 150 dia duct sticking through a flat roof with a SS cowl. We are getting cold air coming down the pipe when the fan is not on. Will this stop it? and will the extract have enough power to open the shutter. Or should we use the SS one?
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QWe have a Siemens kitchen canopy connected to a 150 dia duct sticking through a flat roof with a SS cowl. We are getting cold air coming down the pipe when the fan is not on. Will this stop it? and will the extract have enough power to open the shutter. Or should we use the SS one?answer nowA Hello Paul Thank you for your question. The stainless steel or plastic damper will do your application.
Does this need to be inserted in a horizontal duct or can it work in a vertical run. Also can it be fiited at the intake side of the fan? Thanks.
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QDoes this need to be inserted in a horizontal duct or can it work in a vertical run. Also can it be fiited at the intake side of the fan? Thanks.answer nowA Hello Bryan Thank you for your question. Yes the backdraught shutter has to be installed horizontal. If installed vertically it would be open all the time. I would recommend it to be installed just before going out though the wall.
does this product shut with gravity, or is it spring loaded, is it floppy when its windy
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Qdoes this product shut with gravity, or is it spring loaded, is it floppy when its windyanswer nowA Hello John, The item does not contain a spring and therefore pivots based on gravity and fan pressure.The shutter is designed to only open one way and therefore the item will not flap backwards due to the wind, although if there is more pressure on one side than is being generated by teh fan your shutter may struggle to open.Kind regards, Michael
Deptford Diner (Trustpilot) (verified owner) –
Great service from the in-store team. Helped to problem solve a couple of issues and provided great advice. Really good value products as well(DUCVKC353 – Kair Round Pipe Connector with Backdraught Shutter – Non-Return Damper Flap – 125mm)
Lee Burnip (verified owner) –
Excellent quality excellent price
Colin Young (verified owner) –
as expected good quality
Stewart Rodger (verified owner) –
Works well stops back draughts and easy to fit.
Roger Hibben (verified owner) –
I thought the construction was weak and the shutter would seize if it was tightened up to much.I would have preferred to pay more for a stronger product.
Richard Goldsmith (verified owner) –
Fitted easily and works well
Gary Thomas (verified owner) –
seems to work OK. Just fits into the Kair insulated ducting with a bit of fiddling. I think there should be a product that fits directly onto an in-line-fans outlet, or alternatively the wall vent outlet or tile vent outlet. The ducting could then be attached to the backdraft shutter.
Gary Thomas (verified owner) –
seems to work OK. Just fits into the Kair insulated ducting with a bit of fiddling. I think there should be a product that fits directly onto an in-line-fans outlet, or alternatively the wall vent outlet or tile vent outlet. The ducting could then be attached to the backdraft shutter.
John Storey (verified owner) –
A much needed item well worth it
Frank Meldrum (verified owner) –
Just what I was looking for.
Jason Tyszko (verified owner) –
Great producr
ALISTAIR MAGILL (verified owner) –
Shutter arrived on the estimated date. Simple unit which is well designed. Easy to install and no fittings required. You need to make sure that the unit is installed in the correct orientation to suit the airflow from the fan and so that the flap falls to the shut position when the fan is not switched on.
Max Varnom (verified owner) –
works fine
Peter Lawson (verified owner) –
excellent product used in my kitchen hob fan in the loft and with all these gales blowing the shutters outside we only heard a small ping when the shutter closes brilliant it was noisy before but almost silent now
Ronald Brown (verified owner) –
Seems to work well certainly stops any backdrafts
Don Gusrino (verified owner) –
Excellent, they were helpful and knowledgeable about the products
Nigel Bradley (verified owner) –
This is a very simple device and therefore I consider it will be low/no maintenance as there is not much that can wear out, have fitted on a slight angle which Im hoping will ensure gravity stops it from knocking in blustery winds, time will tell, if Im wrong then it is easy to remove the flap by squeezing the fitting and then the flap pops out (which will also be handy if it ever needs dust removed).
Ian Lynch (verified owner) –
Superior design to one I purchased a year ago. Works well.
Kenneth Reed (verified owner) –
It works fine and fits the pipeline
anthony heath (verified owner) –
geat product was just what was need to shut out the back draft
Timothy Streater (verified owner) –
Very useful item to allow shutting off airflow when fireplace not in use. Easy to add a couple of pullstrings by making holes in the damper with a bradawl.