Non Return valve for extractor fan

[Paul Neill]

A few years ago, I refurbished my bathroom. When fitting an extractor fan, i was able to get a non return vale for the ducting. Does anyone know where these can be purchased on line?

Many thanks

[Toby]

Try

> Installation > Ventilation > Ducting & Accs. = Dampers.

Items 15665 for 100mm duct (£2.75), 15666 for 125mm (£3.19) & 15481 for flat channel ducting (£1.40). All plus vat & £5 delivery

[David W.E. Roberts]

How about the gravity flaps e.g. 13629 - these look very non-return.

[Lurch]

Fantastic suggestion, I've fitted loads, no problems at all and its a lot easier than in line backdraft shutters.

[David W.E. Roberts]

Let me know how you get on - could be an upgrade for my fan :-)

[N]

I have recently had an extractor fan fitted in my bathroom. The house is quite exposed to the elements and the fan is getting a fair draught through it.

Could you tell me if these have any impact on the performance of the fan whilst it is extracting?

Also which type are they is the back draft protection from the outside grill or a one way valve type thing in the pipe? Which is better and why?

Thanks

[Lurch]

I would go for the gravity grille option, you've got to fit a grille anyway when you're installing the fan so there isn't any extra work involved. They are also available off the shelf at wholesalers and diy stores. If you went for the backdraft shutter option you have to ensure it is a totally airtight seal within the duct which can be tricky and can also make it more difficult if you have to remove the fan for repair. Also you would struggle to find any off the shelf, they'd have to be ordered from somewhere. Most 4" fans have a fair bit of draught coming through if there is just a standard open grille on the outside, changing it for gravity is an easy swap and should solve the problem. With regard to performance unless the fan is directly in line with a huge gale it shouldn't be a problem.

SJW A.C.S. Ltd.