Big Kitchen Fan, Big Flange, big problem
etherhuffer
| Posted in General Discussion on
I bought a big Fantech RE10xl for our kitchen overhaul. This is a whopper, with about 800 CFM that we will put on an electronic speed control(Don’t really need 800 but 400 is too low).
S0….. Brown truck brings big box with big fan. Cool! I knew the base flange was 20 inches but….
My hole to my roof is right at the wall of course. I have a low pitch roop with torchdown gutters(built in gutters. No evil comments please, I bought it that way. ) With the large flange, there may be at best one or two rows of shingles before the top of the gutter line. Is this enough? We are in Seattle. Wet not warm. My concern is that a gutter back up could make that devil a leak potential, since I have to lift shingles to install it as well. Any ideas?
“Democracy is when the people know exactly what they want, and get it good and hard.” HL Mencken
Replies
I'm a little confused trying to picture this. Does water currently tend to backup one or two rows of shingles above the gutter? If so, sounds like you have more serious issues to address. Do you have to lift shingles at the low side to install it? Usually roof flanges go under the shingles on the high side, over the shingles at the low side. Perhaps a pic or a website link could clarify?
I occasionally get back ups in big rain storms. Try as I do to keep stuff out of the gutters, It happens. The big problem is that they built up the gutter over old material, so the flow to the scuppers is kind of low. I guess you are right, the flange will be over the shingles at low end. It needs to be nailed or screwed to secure it from vibration, but at that point I am over the rafter tails, which are open, not closed. Thanks for the help."Democracy is when the people know exactly what they want, and get it good and hard." HL Mencken
Just a thought--I don't suppose the flange is located where you could put a downspout out of the gutter to prevent overflow? Or maybe a sort of "pitcher lip" so the water would run out over the front side if it backed up, rather than running into the fan duct?
Is there any kind of a jack on top of the flange - meaning does the water just have to reach the flange to run into the kitchen, or would it have to be higher, at the top of the jack? Be sure to seal it well under the flange when you install it, since it sounds like the flange will occasionally be in standing water.