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    jchoo's Avatar
    jchoo Posts: 69, Reputation: 2
    Junior Member
    		  
    #1

    Oct 27, 2013, 08:41 PM
    Bathroom roof vent
    I've got an existing 3" dia bathroom fan vent going through the roof. I want to switch it to 4", is it advisable to have a reducer (4x3) to connect to the exhaust at the roof end?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Oct 27, 2013, 08:54 PM
    Switch what, the fan or pipe? If it's the fan, just get a 4 x3 reducer and install at the fan,leave the pipe 3". Not that much static pressure to worry about.
    jchoo's Avatar
    jchoo Posts: 69, Reputation: 2
    Junior Member
    		  
    #3

    Oct 27, 2013, 09:05 PM
    I want to switch the fan and the pipe, but if it's not a big deal to leave the 3" pipe, then I'll just get a 4x3 reducer and install at fan. With the 3" should I worry about not pushing enough air out since now the fan is larger?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #4

    Oct 27, 2013, 09:17 PM
    Quote Originally Posted by jchoo View Post
    I want to switch the fan and the pipe, but if it's not a big deal to leave the 3" pipe, then I'll just get a 4x3 reducer and install at fan. With the 3" should I worry about not pushing enough air out since now the fan is larger?
    Not much back pressure to worry about. Save your money and put the 4 x3 at the fan. I just did one like that and it works great.
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