Range Hood Venting Problem

15 years ago

I'm installing a range hood in our kitchen. The hood is a Broan E66130SS. And for reference, here's a photo of the kitchen:

The stove is on an interior wall. The wall to the right with the window is an exterior one. We have a torchdown roof and a couple of contractors have recommended against going up and through it, so that leaves going out the exterior wall.

The hood has a rectangular exhaust port - 3.25"x13.75" and requires that size rectangular or 8" diameter round ducting (it's 600 cfm). To use round ducting and get to the exterior wall a straight boot and a ninety degree bend are required. The interior of the cabinet is 11.25" deep and 12" tall.

The plan was to install the hood under the cabinet above the stove and run the ducting through that cabinet and out the side wall. The problem that I've run into is that the interior of the cabinet is 12" tall, and the combination of the straight boot and 8" diameter 90 degree bend is 19" tall. It *might* be possible to use the space beneath the interior of the cabinet and the range hood, but that still only gets me up to a total of 13.5". There is a little over four feet of space between the top of the cabinet and the roof, so it might be possible to build a soffit that fills part of that space that the duct could run through, but because the cabinet is only 12" deep, and the positioning of a stud on the exterior wall that I want to avoid, it might be difficult to build a soffit with enough space inside for the duct to run through. We also like the open uncluttered look that it has now.

Is there any other way that I can go from the rectangular exhaust port to round duct within that 12 to 13.5" space? Is there some way to get custom ducting made? If that's the case, maybe I could get some sort of rectangular ducting to go through the cabinets and then put in a boot to connect to the round exterior vent?

Or is there some other easier way to do this that I haven't thought of?

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Comments (3)

brickeyee
15 years ago
"We have a torchdown roof and a couple of contractors have recommended against going up and through it,"

Find someone who knows how to go through the roof.

It is not that hard with torch down.

A remote blower might be worth the expense.
John Liu
15 years ago
You can have a custom piece made, combining the transition with the elbow. You might lose a bit of efficiency and gain a bit of noise, but those seem like minor tradeoffs. I'm not sure if the stud in the exterior wall is a problem, not enough info, but the duct can jog over, or transition back to rectangular, to solve it. An external blower might compensate for the tradeoffs.

Or, if the horizontal run is run above the existing uppers but tight up against the wall, I wonder how visible it would be to the casual eye. You could paint it to match the wall. It could be rectangular for a lower profile.

Doesn't seem like a big obstacle, especially if you find a sheetmetal fabricator rather than using off the shelf pieces.
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mbcullen
Original Author
15 years ago
I think I've got this figured out.

First I spoke with the roofing company that put ours on. They recommended against going through the roof if possible. Not because it's terribly difficult, but because it's just generally better to have fewer holes up there. With that many people giving me the same story, I think I'll just go out the wall because it is an option.

Then I spoke with the guy I bought the ducting from before. I must have done a poor job explaining what I was trying to do then, or maybe he was getting anxious to get out of there for the upcoming holiday weekend, but he sold me the wrong parts. Instead of the straight boot and 90 degree bend, he should have sold me a torpedo boot which combines the two into one, similar to what you were describing as a potentially custom built piece, John. Then I can use one of the 90 degree bends to jog over a few inches. When they turned in the opposite direction, it's exactly what they do.

So I'll be able to avoid the roof, keep everything inside the cabinets and there shouldn't be any custom pieces involved. Perfect.