Vent Hood - Is Vent a Hood the only option?
jlarsen321
2 years ago
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kaseki
2 years agoRelated Discussions
Vent-A-Hood VentAHood Range Hood BH340PSLB
Comments (2)Check with your local planning department. With 10" ducting, you definitely need a roof jack that doesn't constrict air flow. The standard Vent-A-Hood recommended roof jack is fairly low profile. It seems unlikely that it wouldn't comply with your local wind resistance standards. Are you sure it's not just your roofer's resistance to using something different from what he usually installs? It's a pretty sure bet that yours isn't the only house in Miami-Dade County with a 900 cfm Vent-A-Hood....See MoreAre there any great options for vent attached to range hood?
Comments (5)^^what Patricia said. Check out https://www.luxurymetals.com/WallVents.html?ne_ppc_id=1972&ne_key_id=31618843&gclid=Cj0KCQiA-onjBRDSARIsAEZXcKZsxdCX3BTboZp-Ai6hDhwgQdAp0LAmZVNIxuSRS6aLBSI_1Tx9z-AaAlnpEALw_wcB They have all sizes and shapes of vents with dampers and seals to stop heat loss/air flow when not in use....See MoreRange hood venting options
Comments (10)mike_home Your point is correct. The point I failed to make is that the ducting is supposed to be sized for minimal impingement deposition of grease particulates that aren't captured by the hood filter -- thus the intent of the velocity range specified by NFPA 96. (Also please see the reference below.) In any case, for a duct meeting velocities up to 2000 ft/min, a modest duct length will have much lower pressure loss than the baffles or mesh filters in the hood. (And, I should note, lower noise generation than the blade tip turbulence of the blower producing that velocity.) Hence the duct size does not dominate the volumetric air flow, the hood filtering does in concert with the limitations shown on the hood blower's fan curve plot. I would recommend against a duct size so large that the actual, not the rated, air flow velocity is below 500 ft/min during grease particulate generation, unless the duct is so short that absolute grease collection is negligible. Ref: ASHRAE Journal, November 2002, pages 26 - 31, New Rules For Kitchen Exhaust, William D. Gerstler...See MoreVent-A-Hood M Line Hood vs Wall Mounted Hood with Magic Lung
Comments (5)Vent-a-Hood systems have an advantage and a disadvantage. The advantage is no baffles and hence no baffle pressure loss. The disadvantage is that the squirrel-cage blowers have a fan curve that loses flow rate with pressure loss faster than the radial and axial blowers used by others. Hence, use of VaH hoods is best done with short, straight ducting and low pressure loss make-up air approaches. For any serious hot cooking, you should plan to have 90 CFM per square foot of hood entry aperture, which you have not yet specified. With ideal ducting, the result would be met by a VaH blower just slightly more powerful than the result value. However, with more typical ducting and MUA pressure losses, the blower rating will need to be a larger factor over the requirement, possibly higher than the 1.5X I suggest for baffled hoods. Low noise can be achieved using a remote blower (external or in-line) with a silencer between blower and hood. All fans moving a lot of air per second when located next to the cook will be noisy. I don't own any magic VaH hoods, so I can't compare and/or contrast their noise levels....See Morekaseki
2 years agoShannon_WI
2 years agolast modified: 2 years agoVerbo
2 years agoopaone
6 months agolast modified: 6 months agokaseki
6 months ago
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