Yes. Rigid duct can be used. If you have further technical or installation questions, please contact our Broan-NuTone Technical Support Department at 1-888-336-6151 between 8:30 AM and 7:00 PM (EST) Monday-Friday.
You may want to review the installation instructions that are provided on the Home Depot site. The 634 can be secured using roofing cement to seal top and sides of roof cap. Seal all nail heads with roof cement as well. If you have additional questions, please contact our Broan-NuTone Technical Support Department at 1-800-637-1453 between 7:30 AM and 6:00 PM (CST) Monday-Friday.
No. This is designed for a roof. The door flap may not close properly. If you have a unit that is exhausting though a wall, we recommend using the wall caps. If you have further technical or installation questions, please contact our NuTone Technical Support Department at 1-888-336-6151 between 8:30 AM and 7:00 PM (EST) Monday-Friday.
The roof cap can make noise. That is normal, however, you may want to reach out to our Broan Technical Support Department at 800-637-1453. They are available M-F, 8:00am - 6:00pm CST.
This roof cap is for exhaust ventilation only. The damper will prevent air from entering the home and only open when air exiting the home forces it open (like a vent fan). You will have to find a different solution for bringing air into the home. Thank you for considering our products for this project. You may also consider checking into local building codes to be sure you are compliant.
The damper is just a thin piece of sheet metal attached with a hinge - lifts up to open when air pressure comes up from fan. If enough moisture can settle inside the hood then it would be possible that it might freeze closed but not likely to freeze in the open position. If your roof pitch is great enough to keep most moisture out of the hood then you should be alright.
my range hood 750 cfm , all the smoke blow out of the roof top
I've got one installed on an asphalt roof. Maybe he is talking about a metal roof??? I never heard of the rubber boot thing. I don't remember Brown's instructions mentioning this. It is installed just like your typical roof vent. You put roof tar around the flat metal part that comes in contact with your roof and you push the top of the flat metal piece under your shingles and nail it in. I haven't had any problems. Mine came with pretty good directions, just follow them. If you live in an area where it gets cold in the winter, you should use 6 inch duct insulation along the entire run of you 6 inch duct, from inside of roof to the ceiling where it enters you kitchen. If you don't condensation will run down the duct work and water will drip all over your ceiling and eventually damage the drywall.
Bought mine 2 yrs ago. Works great, easy install.
It mated to standard 6" round ducting well but the stem from the cap protruded about 1.5" therefrom the cap. So to make the connection easier, I initially attached a short (@ 3") straight length of 6" round ducting to the stem to enable easier access to connect it to flexible or rigid ducting in my crawl space attic. Shouldn't make the short extension longer cause it may prevent installation into roof hole.