Bathroom fan: have 4 inch duct, want a 6 inch and more powerful fan

Users who are viewing this thread

slindenkohl

New Member
Messages
2
Reaction score
0
Points
1
Location
92629
If my current fan vents to a flat roof and is a 4 inch duct, what are my options for installing a more powerful fan - at least 150 CFMs. How hard is it to replace the entire duct? Do I need to or can I use an adapter? I have a large bathroom with a double shower, at least 150 sq. feet.
 

WorthFlorida

New chemo regiment started Aug 20th.
Messages
5,990
Solutions
1
Reaction score
1,073
Points
113
Location
Orlando, 32828
One problem is do you have access above the ceiling to make the change? You can use a flex duct which will make it easy to do. You're not in a cold climate so condensation would not be an issue. The real issue is the size of the current exhaust vent/hood. If it is for a 4", it can cause some restriction. Changing it up to 6" exhaust hood may require some work on the roof to properly seal it and allow rain water to drain away.
 

Jeff H Young

In the Trades
Messages
9,803
Reaction score
2,481
Points
113
Location
92346
Its easy to replace the entire system as long as you have access . of cource every job is differant . the flat roof makes it easy to go on roof safely assuming you have a large attic to work in that will make it easy as well
 

slindenkohl

New Member
Messages
2
Reaction score
0
Points
1
Location
92629
Thank you. The fan is above the toilet and it just exhausts a couple of feet up on the roof. Sounds like I can't just switch to a 6 inch duct easily.
 
Top