On Apr 2, 10:36 am, "coltrane" wrote:
On Apr 2, 8:09 am, "coltrane" wrote:

I would like to put exhaust fans in 2 bathrooms. should these fans
exhaust out the roof or can they just exhaut into the attic?

thanks

john

thanks to all. now I have to get the guts to open my roof

cheers

If the bathroom doesn't have a shower/bath then going into the roof
would be OK since you're not venting any moisture. I just put to
bathroom fans in my house, I just had a roofer guy install the vents.
I bought them at Home depot and he just charged me $75 to install
them.

Some tips when doing this.
1. Over size the fan. If the chart says 80 CFM go with at least 100
You will never be sorry that your fan works too well. It will also
let you have longer ductwork and reduce the possibility of getting
condesation drips.
I put a 110 in a 8x8 bathroom, and the shower can't even fog the
mirror.

2. Use a timer instead of a switch.

3. If you have a roofer install your vent, get up on the roof and mark
were you
want the vents, or be there when he's installing them. My roofer,
despite detailed drawings and measurments, still managed to put one
vent in the wrong spot, which made me use a lot longer duct length,
but still seems OK.