4" outlet duct for a hood fan.
sergitin39
10 years ago
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10 years agokaseki
10 years agoRelated Discussions
Hood vent duct meets 2x4 in wall
Comments (4)There will be some repair work that will have to be done to the wall to run the duct work if you install a vented hood. Without too much more work the stud could probably be moved. A header would need to be installed to carry the load of the stud, just as would be done with any doorway or window. So I guess it comes down to what amount of work the vented hood is worth. I definitely agree that the downdraft would be better than the non-vented hood. The other thing to consider is the fact that adding 2 more 90 degree turns and the extra ducting is going to diminish the effectiveness of the fan. With that length you may need an in-line fan installed to boost the power. Your appliance provider should be able to help you figure out what you need for the amount of pipe you have. Jesse Pender...See MoreMiele Hood Fan: Hiding the New Duct Work, Best Options for Design & ..
Comments (25)Maybe I should have opened up the email first. Check this out! My client asked me for a top designer and I told her to call Corey. I have know him for a long time and he is as anal about design as me. The big difference between us is that he is both a certified designer and NKBA design teacher/speaker - and I am not. I have opinions but am better building than designing I think - especially when it comes to Kitchens. This is going to be a Kick Ass project. Glad I have a small part in it. I love designers who can do these 3D drawings! Thanks Corey! http://www.houzz.com/pro/coreyklassen/corey-klassen-interior-design...See MoreBetter to reduce range hood duct size earlier in run or later?
Comments (3)@3onthetree is correct, within the assumptions presented. However, so long as you are satisfied with well under 200 CFM, you can transition to 4-inch duct. (With the specified 6-inch duct, the blower would probably only push 300 CFM at best, and this assumes very low pressure loss in whatever method you have of providing make-up air. There will be slightly less overall duct pressure loss if the duct to the ceiling is 6 inches rather than 4 inches, but this difference may be trivial depending on how long the 4-inch duct is to the outside. Impingement grease buildup from too high an air velocity may be compensated by not likely actually achieving a very high velocity. Note that even 200 CFM in a 4-inch duct results in a duct velocity of 2300 ft/min, undesirably high, and quite possibly beyond the capability of the hood blower. Ventilating to the outside will usually beat recirculating, but we don't know enough facts to be sure in this case....See MoreRange hood asks for 6” duct. Is a larger 8” duct ok/better?
Comments (4)Yes, I meant 8-inch will be better, in general. Grease collection at various points is a complex matter. For example, one reason simmering bacon, in spite of its low upward plume velocity, needs a higher than minimum air flow is that the baffle centrifugal extraction process needs enough velocity to work. In general, however, hotter cooking generates faster plumes and needs higher hood intake air velocities. If the duct is warm enough and the flow rate not too low, the grease collection via condensation will be low. If the velocity in the duct is not too high, the grease collection via impingement will be low. Most home cooking levels are such that what does collect in the duct rancidifies (hardens to a varnish) and doesn't become a nuisance or fire hazard. Commercial ducts, however, need yearly cleaning and inspection. If performance is your priority, then review of hood threads here will provide insights into the requirements needed to achieve good capture and containment....See Moresergitin39
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