Installing a kitchen hood vent on roof
Hello, I am installing a 600 CFM kitchen hood in our house and need some advice. The house currently does not have ducting to vent outside, and so I also need to do the ductwork and install a vent on the roof. These are a couple roof vents I had in mind: Speedi-Products 6 in. Black Galvanized Flush Roof Cap with Removable Screen, Backdraft Damper 6 in. Collar-EX-RCGC 06 at The Home Depot OR Master Flow 6 in. Roof Jack with Vent Cap-RJVC6 at The Home Depot But the issue is, if I were to have the ductwork go vertical from the hood and up through the roof for maximum airflow, the vent would be approximately where the red arrow is drawn. For reference, the kitchen is behind the window (below arrow) and the sliding door on the left leads to our dining room. I suspect having a vent right up against the wall and that close to the upper roof is not a good idea, but is that really the case if I install the 1st vent type I have linked? Should I try and place the vent a few feet to the left (on the picture) away from the wall? Although doing so would create more turns in the ducting, thus slightly reducing airflow. Any advice is appreciated, thanks. I do not know of a code requirement for the location of a residential kitchen exhaust. If it were a sewer vent or flue for a gas appliance yes, but with a vent hood I think you're probably limited by common sense and staining the nearby wall and eave with smoke and grease fumes. Don't forget your going to need fresh air into your home. My in laws installed a commercial vent hood in their cabin and bought the type without make up air. I don't know it's cfm but it has a commercial roof mounted 1hp blower. You hear the windows creak and can see the glass in the bigger ones bow inward if the vent hood is turned on without first opening a window. I swear a small child could get sucked up the vent if they get too close. That's a pretty tight house your in laws have there. Remember, too, 600 cfm will change out your air conditioning and heat in short order in a few minutes. Is there a real need for that much suction? I have installed a 700 cfm roof mounted exhaust fan for a client. It was quiet, but totally too much suction, IMO.
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