400 CFM ventilation hood with an induction cooktop?
frazzlehead
4 years ago
last modified: 4 years ago
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Is 600 cfm enough for 36' induction cooktop?
Comments (16)Thank you so much everyone! Breezygirl, I was relieved to find out our limit was 600 cfm. The GC at the Home and Garden Show who told me this said several cities/suburbs in the area have 400 as their limit. Pricepal, most of my friends who have already updated their kitchens didn't know what I was talking about! I think their DHs must have taken care of that or maybe their GC automatically took care if it if they had to have MUA (they didn't know if they had it or not). Jakvis, the working part (i.e., not including the eating area) of my kitchen is about 10 x 13. Kaseki, great information and I'll ask the GCs I interview about this. I don't think I'll lose much power on the vent because the cooktop is on an east exterior wall and should be able to be vented directly out that wall. I'm really not concerned about the pressure dropping in our house as neither of our 2 gas fireplaces (one in FR and other in master bedroom upstairs) have a damper on them so cold air pores in if the doors aren't closed. I was told the dampers were taken off to comply with the code in our area back when our house was built in 1990, but I appreciate the information and warning. Cj, it's great to hear that you're happy with the 600 cfm when used with your Miele! I'll be so happy when I finally have a vented hood! Thanks again!...See MoreHelp. What ventilation for island induction cooktop.
Comments (27)I have the Viking 36" 6 burner all induction cooktop. I also have a Thermador downdraft. I had a Thermador previous to this one and it ran for 20 years without one repair, still is functional but it was part of an electric coil cooktop that I parted ways with when we did our renovation. No problem whatsoever in having the two units together. And the downdraft does not take up much space below whatsoever, particularily if you get the motor that is exterior mounted. Even with it mounted under your induction cooktop unit, it will not take up much space at all. Something is not right about the person who told you it will blow "down" on the unit? First of all, the downdraft ventilation units do not blow, they suck. You can get downdraft ventilators with different "sucking" capacities too, and all of them will rise to different heighths when in use. You dont want one that does not rise high enough as then it will not be able to pull down as much steam, odors etc....See MoreInduction Cooktop Ventilation Recommendations.
Comments (4)The reason the OP can't find CFM requirements anywhere (except for 100's of threads here at the Garden Web/Houzz appliance forum) is that in the residential cooking appliance world, magic and folklore were deemed an adequate substitute for science and engineering. In the commercial world, there is an expansive collection of measurements that can be generalized not only to commercial ventilation, but also to residential ventilation. tl;dr Use 90 CFM per square foot of hood entry aperture to assure that the portion of the cooking plume captured by the hood entry aperture is contained by being pulled through the baffles instead of reflecting off of them and escaping. This specific flow rate has to be achieved in the present of pressure losses from the hood entry aperture to outside and back to the cooking zone. This requires a higher rated blower; without exact analysis, a factor of 1.5 should prove sufficient. Hoods are manufactured with a recommended distance above the cooktop. A rationale for height vs. hood entry aperture size can be made based on measurements of cooking plumes upward expansion. At 30 to 36 inches, overlap of 3 inches all around may be sufficient. This means that an 18 x 36 inch cooktop should have a 24 x 42 inch hood. This should be the entry aperture for best results, so with switches and lights a somewhat greater front to back depth may be desirable along with installing the hood so that the center of the hood entry aperture (and not the hood overall area) is at the center of the locus of pan base extents over the cooking zones....See MoreRange hood - reducing duct from 6 to 4? 400 CFM
Comments (3)The answer to the question is use the larger duct for as much length as possible. From the description, it seems that it could be 6-inches over most of the length, raising the question of why the last bit couldn't be cut larger. Note that duct transitions should be gradual and not abrupt. Your 400 CFM rated blower can only do some lesser flow rate when subjected to pressure loss, some of which is in the hood itself, some of which is in the make-up air path, and the rest in the ducting. Suppose you could actually achieve 200 CFM. Then 4-inch duct would have to be flowing 2300 ft/min, a higher value than desirable and likely to have more pressure loss than the 200 CFM assumption might have assumed. So maybe 100 CFM. You will be in the average condition of 1950s hoods, so all you need is a larger duct to move into th '90s. :)...See MoreJeffrey R. Grenz, General Contractor
4 years agofrazzlehead thanked Jeffrey R. Grenz, General Contractorfrazzlehead
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4 years agokaseki
4 years agoCindi
4 years agoJeffrey R. Grenz, General Contractor
4 years agokaseki
4 years agolast modified: 4 years ago
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