Hood - venting ducts and ventless hoods

18 years ago

Is there a such thing as step down or transition pieces for hood ducts? The wall hood that we purchased (Dacor 36")for our new kitchen has a 10" round vent - too large to fit between the frame work and the stone wall. The vent needs to come out and make a turn to the side and then go down, through to the basement.

Our carpenter and plumber are telling us we can't use the hood. But, if there is a transition piece, to take the 10" to 4" or I think even 6" would work, maybe we can?

They also are saying that any duct would be difficult to run because of having to go verticle then horizontal... and are suggesting a ventless hood.

Any ideas or insights?

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Comments (5)

ron6519
18 years ago
The duct size will be stated on the instructions. Speak to Dacor about the issue. 10" to 4", never. You might be able to go to a different shape duct. But these transitions take distance to achieve. Not always an option.
Call Dacor.
Ron
Jon1270
18 years ago
It's not that it's physically impossible; it's that you'd destroy the performance of the hood. The fan is engineered to work with a particular size duct. You could change shape from round to rectangular, but the cross-sectional area must remain about the same. A rectangular duct 4" wide would have to be over 20" across to be equivalent to a 10" round. Find another way to do it, or find another hood.
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mag77
18 years ago
If you cook at all, ventless hoods are useless.

Vented hoods are the way to go, but you can't expect them to exceed their capability. The scenario you describe has so much air friction, so many changes of size, direction, and shape of duct work, that it would overwhelm any hood.

John
jamesk
18 years ago
If your ducting needs to go down through the basement, you might be better off looking at some sort of downdraft ventilation system. These are not as efficient or effective as an over-the-range hood, but given the situation you're describing, probably a preferrable alternative to drastically undersizing the ductwork and the convoluted duct routing for the range hood you've purchased.

Recirculating (ventless) hoods are basically useless, and something I wouldn't even consider. You'd be much better off with a downdraft vent system.

Is there any possibility that the vent could go straight out the back of the hood through the stone wall? That might be another possibility. Many range hoods offer the option of venting up or out the back.
jim1963
18 years ago
Berbel extractor hood has the best recirculating technology but currently only available in Germany and UK.
In conventional hoods grease is absorbed in filters. Grease particles clog the pores of the filter, and hood performance is reduced in increasing proportions.
With the berbel principle grease is accelerated out of the air by centrifugal force, and is effectively separated at two points.
The interior of the fan box remains virtually free of grease particles. There are no consequential costs, no unpleasant odors, no vermin, and there is no fire hazard.
With berbel the unit can be cleaned with just one wipe, as easy as cleaning a Ceran hob.
The stainless steel tray is made of the highest quality stainless steel and thus is dishwasher safe.

http://www.berbel.de/int/index.php?id=300351

http://www.berbel.de/int/index.php?id=10