My bathroom is about 50sq ft. with 4" rigid running horizontal about 25' with a 120CFM exhaust installed. It did not seem to clear the room that great. So, I put in a 300CFM fan thinking it would be better but notice I am getting blow back from that and it seems like it made it worse. (I was getting a slight amount of blow back from the 120CFM fan as well)
It seems like the problem is the 4" and the distance of it and/or there is not a 1/2" gap under the bath door. The ductwork is in the drywalled ceiling of the basement.
Considering 1CFM per square foot of room space puts me at a 50CFM fan. I was thinking more is better. ( if I understood that correctly)
Would I be better off to put in a 70CFM exhaust fan to match the current ductwork or install 6" ductwork? And cut some off the bottom of the door? I can test that if I keep the door open. Replacing the ductwork to 6" requires I cut the drywall or cut the subfloor above to replace.
Thanks..
It seems like the problem is the 4" and the distance of it and/or there is not a 1/2" gap under the bath door. The ductwork is in the drywalled ceiling of the basement.
Considering 1CFM per square foot of room space puts me at a 50CFM fan. I was thinking more is better. ( if I understood that correctly)
Would I be better off to put in a 70CFM exhaust fan to match the current ductwork or install 6" ductwork? And cut some off the bottom of the door? I can test that if I keep the door open. Replacing the ductwork to 6" requires I cut the drywall or cut the subfloor above to replace.
Thanks..