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Hi, welcome to Just Answer. My name is XXXXX XXXXX I look forward to helping you! There is a damper in the exhaust pipe that closes when not is use. It is quite likely that it is not able to open. Has this always been an issue since installation or have you not really noticed?
Sorry but our time frames keep crossing as we are in Perth Western Australia and Happy New Year to you anyway. However, when we remove the canopy filter, the fan/s are fixed behind screwed in fan guard. We have tried to do what you asked but cannot see anything - just feel air blowing out. I will try attaching a couple of images to help. Also exits into the roof. Thanks Rod and Peta
Thanks for your fast response - it must be the middle of the night for you... Should the fan assembly be removed by a qualified person i.e. electrician or some such (the rangehood is out of warranty so no issue there - just electrical)?
We decided just to go ahead and check the flapper anyway and pulled the housing off. You were right in that the flapper wasn't opening but it turns out that it wasn't stuck, it was a case of when installed the exhaust pipe hadn't been secured and consequently there was no air pressure coming into the outlet to allow the flapper to open. We managed to sort it from there and feel a bit daft that we didn't suspect something earlier when it was extremely loud to operate. Thanks for your help - appreciate your time. All the best Rod and Peta. Cheers XXXXX XXXXX!
That is great news, very well done! Sorry for the delayed response. I am in Montana, USA, so we are a few hours apart! Again, great job! Happy Venting!