2 extractor fans on one outlet?
Yes you could.. but if you’re venting WCs then possibly pumping smells into the other area wouldn’t be good – not sure how 100% effective a non return flap would be on something like this.
Why not put an inline fan on the external side of the Y.. pulling air from both? Switching would be a little more complicated, but not rocket science.
JeffPosted 4 years agoandylMember
+1 for looking into an inline fan after the duct merge. I am guessing that with all the joins etc the duct length will be quite long? If so a bit of additional draw that is switched on when either are used could help and prevent any flow the wrong way. Would have to check the wiring though as it would need to be linked to the wiring in 2 special locations, both should just be the lighting circuit though (but you may have two of those).
Or am I right in thinking that the cooker hood will be a centrifugal fan as that might prevent flow back better than a crappy axial like you get in a bathroom ceiling.Posted 4 years agobigphilblackpoolMember
Any decent inline fan will suffice seperate feeds two seperate switches BUT if done in flex or wastepipe as ive seen most “ducting” done in its just wrong. Flex can compress under the fan power and wastepipe …. just no. a length of spiral with a boot and 2 cap ends as y connectors are expensive. Shortest possible flex connection or solid if your good with 45° and 90°s as for the back draft a one way plate could clog then youd need an acess panel to clean grease regular from the mechanism easily a few hundered quids worth of gear there if done correctly. Ring a company called lindab its who we use for our ducting and a/c gear.Posted 4 years ago
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