Extractor fan +/- backdraught shutter?

[sumboyman]

Hi all I am installing a Manrose MF100T Extractor in to what was a previously very damp bathroom. The outside vent will be coming out the side of the loft/wall rather than vertically though the roof.

I picked up one of these backdraought things: -

http://www.amazon.co.uk/gp/product/B00A50NDEU/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

but have some quesions re intalling it as I cant find anything conclusive online:-

1) Given the type of fan I have which seems fairly powerful is the backdraught going to be a problem in terms of causing too much resistance?

2) Where within the "system" should it be positioned, near the outside vent, near the fan (outlet or inlet) or it doesnt matter?

3)Should the hinge be verticle or horizonal, straight or at an angle or does it not matter?

Thanks for any help/advice you can give.

Steven

 

[Taylortwocities]

It wont cause any resistance to your fan. The flap springs are very weak affairs, but they do work fine.

Mount it oriented as shown in the Amazon picture, it wont work properly otherwise.

Anywhere in the duct system is fine. Some fans have them as part of the fan itself.

 

[sumboyman]

Thanks a lot - much appreciated.