Thread #2975989
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My kitchen didn’t come with an exhaust and the microwave recirculating fan isn’t cutting it. Want to run a duct through the ceiling and to the outside but don’t want to cut a hole in my roof. Found this YouTube video and pretty much exactly what I want to do. If the CFM is high enough from the fan, can I have my pipe go up, make a 90 degree in the attic, then another 90 down out of the soffit? Or should I consult an HVAC company. Not sure what kind of issue I could be creating with pressure.
https://youtu.be/tDzsOKYaflg?si=hRxAh9AZ1_LHRktB
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house built in the 70s, i have a similar setup whole neighborhood does, track homes. but i would recommend using a boot on the end of your exhaust ductl; builders didn't in my home and i found out during a remodel that grease had coated the back side of my drywall after years of cooking.
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>>2975989
get the biggest inline fan youre willing to spend for and go for it. eventually the low spots will end up with nasty goo grease lakes but the entire pipe will be throughly coated by then and its a case of replacing everything. but that will take years
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>>2975989
Two long sweep 90°s are fine. You really want to go through the roof instead of the soffit. If you have any soffit venting, you’ll pull dirty, humid air back into the attic which is what you don’t want. Also, the duct work should be insulated at least R-8 so you don’t get moisture in the attic.
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