How much CFM does a grill really need?
acertain
11 years ago
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jadeite
11 years agoRelated Discussions
Do I really need a 600 cfm range hood for an induction cooktop?
Comments (37)leel.....glad to get your feedback on the induction. Thanks! As for me, I certainly wouldn't mind having to buy a new pan or 2 for the new oven. :-) gsciencechick....thanks for the pots and pans suggestions and the confirmation about induction. I'm ready to be done with gas (although I love the way it cooks) because it's just so dirty to keep clean. muskokascp.....I HEAR you!!! Whatever happened to the days when we just went to the store and asked the opinion of the saleman or perhaps picked out a unit because of style or color? These days we almost have too much info, and it can become crippling, honestly. At some point I just need to make a decision. davidro1.....I love your 'final answer' comment. I WISH!!!! Although I certainly know a lot more than I knew before, I still have questions. But today at the appliance store helped clear up some things. (Meaning that they don't know anything either and I can basically do whatever I want). The inspector on our job (both HVAC and electrical) don't know anything about MUA and can't advise us what we should get. So I just told them I'd get something that wasn't too powerful, and they seemed fine with that. They told us to adhere to the recommendations in the manual that comes with the hood. I swear!!! It's not rocket science.....why is it that nobody knows about this technology?...See MoreHow much of the return do you really need?
Comments (6)So the dimensions of the grate on the wall are ~22.5" wide and 16.75" high. We have another problem. Not sure if it is related to the return Seems like the fan wasn't that strong and it was getting warmer. We've had 90+ degree heat this week. The AC guy came back and said our compressor was overheating. He said to shut it off for an hour and a half to let it cool down. I can feel the temperature rise after 15 min off. At any rate, he can't come back today so I'll turn it back on. Someone else can come back tomorrow morning. We are going to be out but will have the sitter let him in and have him call us when he is done. I asked if the guys should have caught an issue when they did the leak test. Maybe we would have just bought a whole new unit if we knew all these things were wrong. He said that back in June when we did the leak test it wasn't that hot. We just replaced a capacitor two weeks ago. Wish I had checked the thread sooner to ask him the above questions. The unit is in a closet in the garage so this vent is the only place it can really air out. The closet is somewhat spacious so not sure if adding something there would help. I don't think we want to cut a hole in the door and the back wall is solid concrete. I will ask my husband if he knows the tonnage and BTU. Thank you!...See MoreHow much Hood CFM to get for Wolf's 6-Burner Rangetop?
Comments (10)The necessary information may be found by searching this forum. To summarize: Obtain a hood that overlaps the cooktop by enough to capture the rising and expanding effluent. Assume for this discussion a hood with a 42-inch wide by 27-inch deep aperture area. This is shy of 8 square feet. Desirable velocity at the baffles is 3 ft/s, leading to a need for 24 cu ft/s or around 1400 cu. ft./min. Experience shows that only half this is needed due to baffle behavior in directing the effluent flow close to the baffles. (Or to look at it another way, only half the baffle space is aperture.) This consideration yields a value of 700 cfm. To actually flow 700 cfm, the blower needs to do so at some pressure drop determined by the baffle loss, transition loss, duct loss, and MUA replacement air flow pressure loss. For likely conditions, a 1200 cfm rated blower would be desirable. At best, a VAH hood's rated actual flow (600 in Homechef59's message) only avoids part of the pressure loss. It is not equivalent to a 900 CFM blower with a baffled hood except when each is hanging in air without a house and ducting. While a 1200 cfm rated system is recommended in this example, stepping down to 900 rated cfm may be adequate depending on what plume velocity your cooking effluent actually achieves, and what area of aperture you end up with. Some effluent escape (capture but missed containment) or effluent missing the aperture (missed capture) can be expected at some level of flow and/or hood shrinkage. Note that this basis for CFM estimation does not depend on the number of burners that may be in use at one time, but on the pan temperature(s). Every plume rises and has to be captured and contained, and the other hood areas not directly impacted by a particular plume do not help capture and contain it. kas...See MoreHow much range hood do I really need?
Comments (7)The hood's width at 6" wider than the cooktop is ideal, but many people have the hood the same width as the cooktop, and it's fine. Often people don't want to give up the 6" of upper cabinets, or cannot, because the cabinets are already there. If you have the space for a 42" wide hood, it would be the better choice, but is not an absolute requirement. The thinking on hoods has moved somewhat from emphasizing the width of 6" wider, to more emphasis on the depth of the hood front-to-back. Many hoods sold these days are only 20" front-to-back, leaving the front burners uncovered. That is more of an issue than ensuring extra width on the hood. Find a hood that is close to 24" front-to-back if you can. The height of the hood is ideally 30-36" between the top of the cooktop and the bottom of the hood. If you install higher than that, you are allowing too much space for smoke and grease to escape and float around the kitchen. Go lower than that and your cooking area will feel cramped. I want to reiterate what Stan Z said about the correct ducting. You can have the best hood in the universe, but if your duct diameter is too small, your hood performance will be constrained. Most hoods require 8" or 10" diameter - the specs will say which. You can find hoods with specs for 6" diameter, but those hoods will be noisy, as air is pulled through a more narrow space. 600 cfms is usually enough for most people with a 36" width cooktop. Underpowering the hood is a mistake - you will have spent all that money on the hood, and it will be inadequate from the get-go. If you are thinking about going with more than 600 cfms, the advantage would be that you can run the hood on a lower speed setting most of the time, which will be quieter. The disadvantage of more than 600 cfms is that may require make-up air depending on your locality, building code, and how tight your house is....See MoreUser
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