msimon
New Member
I am remodeling our hall bathroom (8 ft x 5 ft) and am replacing the 40+ year old inline GE vent (about 1,000 sones) with a new Panasonic fan.
The room already has a vent going straight up and through the roof, which amounts to about 5 feet through the attic. We live in Los Angeles, CA, so ice and snow is not a problem for us.
I would like to use the vent that's already in place in the roof. I plan to use a metal vent pipe as recommended and I know I'll need a 90 degree elbow plus some other elbow to line up the vent with the roof opening.
The interesting part: the new fan has a 4 inch vent opening, while the old inline fan has a huge 8 or 9 inch pipe.
My question is, should I add connectors to decrease the 9 inch pipe to 4 inches way up high near the roof, or down low near the fan?
My thoughts are: do I want more of the large diameter pipe with a large volume of air at a lower pressure, or more of the smaller diameter pipe with the smaller volume of air but higher pressure? Which would make the fan happier?
An alternate idea is to just run a 4 inch pipe all the way up and into the current (roof jacket?) and fasten the new pipe to something in there.
Thank you in advance for your feedback.
The room already has a vent going straight up and through the roof, which amounts to about 5 feet through the attic. We live in Los Angeles, CA, so ice and snow is not a problem for us.
I would like to use the vent that's already in place in the roof. I plan to use a metal vent pipe as recommended and I know I'll need a 90 degree elbow plus some other elbow to line up the vent with the roof opening.
The interesting part: the new fan has a 4 inch vent opening, while the old inline fan has a huge 8 or 9 inch pipe.
My question is, should I add connectors to decrease the 9 inch pipe to 4 inches way up high near the roof, or down low near the fan?
My thoughts are: do I want more of the large diameter pipe with a large volume of air at a lower pressure, or more of the smaller diameter pipe with the smaller volume of air but higher pressure? Which would make the fan happier?
An alternate idea is to just run a 4 inch pipe all the way up and into the current (roof jacket?) and fasten the new pipe to something in there.
Thank you in advance for your feedback.