Bigger hood or bigger cabinets?
Andrea Webb
6 years ago
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burgermich
6 years agowildchild2x2
6 years agoRelated Discussions
Size of roof cap/ductwork for hood--go a size bigger? If so, how?
Comments (14)I stand mostly corrected by foodonastump. According to page 31.7 of the 2003 ASHRAE Handbook - HVAC Applications: 'Model building codes, such as the IMC, and standards, such as NFPA Standard 96, have set minimum air velocity for exhaust ducts at 1500 fpm. ... ASHRAE research (Kuehn 1998) indicates that there is no basis for specifying 1500 fpm minimum duct velocity for commercial kitchen ventilation, but rather supports reducing NFPA Standard 96 recommendations to 500 fpm. This change allows flexibility for design of variable-speed exhaust systems and retrofitting older systems, though current design practice for new single-speed systems will generally continue to use design duct velocity around 1500 fpm.' The point here is that at the minimum variable speed setting (for commercial kitchens), the flow velocity should be 500 fpm. Most residential variable speed systems will go down to practically zero fpm, so at those velocities, one would be advised to not be broiling hamburger. Grease effluent consists of various sized particles and vapor. The vapor will not condense out until sufficiently cooled. The particles will either be affected by the centrifugal action of the baffles, or not. In the latter case I think the turbulence in the ducting would have to be extreme to compete with the baffles. I don't have Kuehn's paper so subtleties and assumptions should be checked for relevancy to residential use. A synopsis of the paper's results are available on line. I still need to find time to digest it. kas Here is a link that might be useful: New Rules for Kitchen Exhaust...See MoreSize of range hood vent....go bigger than specs?
Comments (11)Thanks---we actually have a little single-story house, so the way our ducts work is that there's a roof cap, then a little run of ductwork in the attic, and then the duct comes out of a hole in the ceiling and attaches to the wall down to the hood. (The wall isn't actually open, though a section the ceiling is where the old vent fan was.) The hood then has a vent cover that clips on to hide the duct along the wall. So nothing complicated to replace (DH actually did the bathroom ductwork himself since it's a pretty accessible attic, but since we have to patch another couple holes in the roof now, we're just having the roof guy do the cap at the same time since it's such a minimal cost.) The main issue with going larger in the future is that we would need to widen the roof hole and the hole in the ceiling, and get a new roof cap and new ductwork in the larger size. Doable, but would be a pain if it's just as easy to do it now. The vent cover for the hood we're getting is 7 7/8" wide, though, so if we did go with an 8" round duct, it would need to reduce to 6" round at the ceiling, rather than at the hood connection, in order to avoid complicated/expensive adaptations to the vent hood....See MoreCabinet hood will be bigger than liner...is that OK?
Comments (1)Yes. The first important requirement is to have a hood aperture large enough for capture. With that achieved, then from a ventilation point of view the surrounding cabinet doesn't matter. As you note, it should be configured for safety (wood not within the distance where exposure to a cooktop fire would be a hazard) and for practicable cleaning. With adequate air flow, the cleaning frequency outside the hood aperture should be fairly low. kas...See Moremantle hoods bigger than cook top.
Comments (1)Here's our plan before the adjustment for large range cabinet....See Morelyfia
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