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Vent a Hood with back vent
We are installing a new DSC gas range and VentaHood with the dual fans
(600cfm) to go over it. Because of the location, it is very difficult to run a duct to the outside. Our contractor suggested getting a back-venting model and running a duct (rectangular?) down through the wall into the crawlspace and then laterally out. Does this make sense? It will be about a 17 foot run (4 feet down, 13 feet across). Do these things have to be vented in the upward direction only, or it doesn't matter as long as the fan is strong enough and there aren't too many "bends"? Thanks for any suggestions. -Morgan |
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Vent a Hood with back vent
(Morgan) wrote in message . com>...
> We are installing a new DSC gas range and VentaHood with the dual fans > (600cfm) to go over it. Because of the location, it is very difficult > to run a duct to the outside. Our contractor suggested getting a > back-venting model and running a duct (rectangular?) down through the > wall into the crawlspace and then laterally out. Does this make > sense? It will be about a 17 foot run (4 feet down, 13 feet across). > Do these things have to be vented in the upward direction only, or it > doesn't matter as long as the fan is strong enough and there aren't > too many "bends"? > > Thanks for any suggestions. > > -Morgan Morgan -- 1. As to the general question whether a rangehood has "to be vented in the upward direction only"? The answer is no. For similar reasons, we vented our rangehood as your contractor suggested. The duct comes out of the back of the rangehood, runs inside the wall (using rectangular duct), through the floor into the basement, across the basement ceiling (it's 8" round duct at this point), and outside through a window. Ducting run is around 20 feet overall, plus a couple of bends. Is this the most efficient routing? Of course not. But it works just fine. We did get a more powerful hood than the usual formula would otherwise suggest to compensate for the less-than-ideal run -- and the other aspects of the installation are also all along the preferred lines. We've had it up and running for about two months, and I'm satisfied. 2. Some details. The hood is over a 30" Blue Star rangetop. Total BTU is 66,000. Conventional wisdom says take total BTU and divide by 100 to get CFM (so that's 66,000/100 = 660 CFM). We got a 900 CFM dual blower hood to try to compensate for the routing. Plus the hood is mounted at 30" above the cooking surface (more or less the preferred height) and the hood is 36" wide, also following the preferred rule of 6" wider than the range/rangetop. The hood we got is a Best by Broan K210A (that's a 10" high, under-cabinet, pro-style hood) with the dual P8 in-cabinet blower. (Could also get a remote blower instead, if you prefer.) The Best K210A (at 10" high, 22" deep) is basically a slightly smaller version of the K260A (at 18" high, 24" deep); the K260A would have been too tall for our cabinet arrangment. 3. One advantage of the Best hood is that it does allow you to run the ducting directly out the back of the unit, rather than only out the top. This eliminated one sharp bend -- plus it means that we lost no space in the cabinet above the hood (as ducting goes directly into wall). I believe Thermador under-cabinet Pro-Style hoods also vent out the back (as well as the top). 4. I think the Vent-A-Hood specs are saying that the ducting can only run out of those units from the top, and not the back. That would not be preferable if you then want to run the ducting downwards (as it adds an extra bend). There is more or less continual debate about Vent-A-Hoods in the appliance forum at the gardenweb site (www.thathomesite.com). Many love them -- and, in particular, claim they are quieter than other hoods. Others worry about cleaning them (as there are no filters). The Best by Broan is resonably quiet (for an inherently noisy appliance) at lower to mid fan-speed settings and reasonably loud at upper mid to high speeds; I haven't needed to use the latter yet to get the job done. Hope this helps. |
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Vent a Hood with back vent
Thank you for a thorough and well written reply. We are currently
considering re-modeling the entire kitchen and may move the range location so that venting is easier. But if not, we will go for the down ducting and make sure we get a proper hood. Thanks again. -Morgan (MEM9) wrote in message om>... > (Morgan) wrote in message . com>... > > We are installing a new DSC gas range and VentaHood with the dual fans > > (600cfm) to go over it. Because of the location, it is very difficult > > to run a duct to the outside. Our contractor suggested getting a > > back-venting model and running a duct (rectangular?) down through the > > wall into the crawlspace and then laterally out. Does this make > > sense? It will be about a 17 foot run (4 feet down, 13 feet across). > > Do these things have to be vented in the upward direction only, or it > > doesn't matter as long as the fan is strong enough and there aren't > > too many "bends"? > > > > Thanks for any suggestions. > > > > -Morgan > > > Morgan -- > > 1. As to the general question whether a rangehood has "to be vented > in the upward direction only"? The answer is no. For similar > reasons, we vented our rangehood as your contractor suggested. The > duct comes out of the back of the rangehood, runs inside the wall > (using rectangular duct), through the floor into the basement, across > the basement ceiling (it's 8" round duct at this point), and outside > through a window. Ducting run is around 20 feet overall, plus a > couple of bends. > > Is this the most efficient routing? Of course not. But it works just > fine. We did get a more powerful hood than the usual formula would > otherwise suggest to compensate for the less-than-ideal run -- and the > other aspects of the installation are also all along the preferred > lines. We've had it up and running for about two months, and I'm > satisfied. > > 2. Some details. The hood is over a 30" Blue Star rangetop. Total > BTU is 66,000. Conventional wisdom says take total BTU and divide by > 100 to get CFM (so that's 66,000/100 = 660 CFM). We got a 900 CFM > dual blower hood to try to compensate for the routing. Plus the hood > is mounted at 30" above the cooking surface (more or less the > preferred height) and the hood is 36" wide, also following the > preferred rule of 6" wider than the range/rangetop. The hood we got > is a Best by Broan K210A (that's a 10" high, under-cabinet, pro-style > hood) with the dual P8 in-cabinet blower. (Could also get a remote > blower instead, if you prefer.) The Best K210A (at 10" high, 22" deep) > is basically a slightly smaller version of the K260A (at 18" high, 24" > deep); the K260A would have been too tall for our cabinet arrangment. > > 3. One advantage of the Best hood is that it does allow you to run > the ducting directly out the back of the unit, rather than only out > the top. This eliminated one sharp bend -- plus it means that we lost > no space in the cabinet above the hood (as ducting goes directly into > wall). I believe Thermador under-cabinet Pro-Style hoods also vent > out the back (as well as the top). > > 4. I think the Vent-A-Hood specs are saying that the ducting can only > run out of those units from the top, and not the back. That would not > be preferable if you then want to run the ducting downwards (as it > adds an extra bend). There is more or less continual debate about > Vent-A-Hoods in the appliance forum at the gardenweb site > (www.thathomesite.com). Many love them -- and, in particular, claim > they are quieter than other hoods. Others worry about cleaning them > (as there are no filters). The Best by Broan is resonably quiet (for > an inherently noisy appliance) at lower to mid fan-speed settings and > reasonably loud at upper mid to high speeds; I haven't needed to use > the latter yet to get the job done. > > Hope this helps. |
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Vent a Hood with back vent
MEM9 > wrote:
4. I think the Vent-A-Hood specs are saying that the ducting can only > run out of those units from the top, and not the back. I had VAH add their "lowered blower deck" option to my 18" tall Emerald model, so that I could have a rear duct (directly through the outside wall on which the hood is hung.) The lowered deck drops the "ceiling" of the hood nine inches, making the hood only nine inches tall inside. The upper nine inches is open space, which allows one to use VAH's 90-degree elbow to cause a rear exit from the hood. The entire elbow is invisible from the room. The only drawback is that one has a smaller volume within the hood, but this has never been a problem for me. Even with high-heat cast-iron searing, the blowers empty the hood canopy with easy. General kitchen photos, with views of the hood in place at http://www.cfcl.com/rick/pix/finished.html Detailed hood photos, showing the ducting, at http://www.cfcl.com/rick/pix/hood/ -- - rick http://www.cfcl.com/~rick/ Rick Auricchio Macs Only: Macintosh support I acknowledge the existence of a higher power, and have therefore installed surge suppressors. |
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Vent a Hood with back vent
Rick Auricchio > wrote in message >...
> MEM9 > wrote: > > 4. I think the Vent-A-Hood specs are saying that the ducting can only > > run out of those units from the top, and not the back. > > I had VAH add their "lowered blower deck" option to my 18" tall Emerald > model, so that I could have a rear duct (directly through the outside > wall on which the hood is hung.) The lowered deck drops the "ceiling" > of the hood nine inches, making the hood only nine inches tall inside. > > The upper nine inches is open space, which allows one to use VAH's > 90-degree elbow to cause a rear exit from the hood. The entire elbow is > invisible from the room. > > The only drawback is that one has a smaller volume within the hood, but > this has never been a problem for me. Even with high-heat cast-iron > searing, the blowers empty the hood canopy with easy. > General kitchen photos, with views of the hood in place at > http://www.cfcl.com/rick/pix/finished.html > > Detailed hood photos, showing the ducting, at > http://www.cfcl.com/rick/pix/hood/ Rick -- Ah, useful information about the "lowered blower deck" option for the VAH,allowing you to vent out the back, instead of the top. Given your description, though, it sounds like this option would not work with a VAH that is only 9" high to begin with (as opposed to 18" high, like yours). Is that right? Nice kitchen, by the way. Morgan -- If you can rejigger the kitchen to improve the ducting, all the better. But my experience suggests you needn't do anything you really dilike just for the sake of avoiding having to run the rangehood ducting downwards. |
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Vent a Hood with back vent
MEM9 wrote:
> > Rick Auricchio > wrote in message >... > > MEM9 > wrote: > > > > 4. I think the Vent-A-Hood specs are saying that the ducting can only > > > run out of those units from the top, and not the back. > > > > I had VAH add their "lowered blower deck" option to my 18" tall Emerald > > model, so that I could have a rear duct ... > > Ah, useful information about the "lowered blower deck" option for the > VAH,allowing you to vent out the back, instead of the top. Given your > description, though, it sounds like this option would not work with a > VAH that is only 9" high to begin with (as opposed to 18" high, like > yours). Is that right? To your original questions. In a VAH the blower outlet is rectangular. On top of this, one attaches a 'transition' piece. (In our case, an island model, this transition is to an 8" round duct - which goes straight up through the roof.) They make a variety of other transition pieces - rear exit, side exit, Y-shaped ones for the really big hoods, etc. Buying a VAH is kinda like ordering a new car from the factory - you tell them which options you want, and they build it to spec. According to the VAH Workbook, there are several models with rear exit options. And I think they can even custom make things - within reason. So it may be best to call your VAH rep to see what is possible for the model you are looking at. Walt -...- Walt Spector (w6ws at earthlink dot net) |
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Vent a Hood with back vent
MEM9 > wrote:
>Given your > description, though, it sounds like this option would not work with a > VAH that is only 9" high to begin with (as opposed to 18" high, like > yours). Is that right? Correct. You need the 18" tall hood in order to lower the deck. > Nice kitchen, by the way. Thanks! -- - rick http://www.cfcl.com/~rick/ Rick Auricchio Macs Only: Macintosh support I acknowledge the existence of a higher power, and have therefore installed surge suppressors. |
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Quote:
Thanks for the lengthy reply and indeed it answers my query. Both Morgan and i have actually the same predicament about Vent-A-Hood range hood. |
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Range hood technician/contractor knows best when it comes to duct installation since they are the experienced ones compared to us.
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