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Old 08-15-2020, 08:19 PM   #1
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Connecting 3 1/4" x 10" Stack duct to exhaust vent


The ducting for the kitchen's range range hood ends up going to an exterior wall via a 3 1/4" x 10" stack duct between the ceiling joists. The exterior wall mounted exhaust vent is like this.

https://www.imperialgroup.ca/product...l-exhaust-hood

How is this vent and stack duct supposed to connect? I know if it were round ducting, one end is crimped so there is always an inny and an outy, and they mate nicely that way. I know for rectangular ducts the S and drive cleat system is used but what about this? That "tailpipe" on the vent is much thicker sheet metal than the stack duct.

Am I just supposed to crimp the end of the rectangular stack duct so that if fits inside of the vent, then screw and tape?

I looked online and just can't find an example or reference for this.
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Old 08-15-2020, 09:25 PM   #2
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Re: Connecting 3 1/4" x 10" Stack duct to exhaust vent


I would normally use a button punch and slip (s lock). You probably don't have a button punch tool so just use slip, screws and foil tape for the connection. The corners of your duct will need to be notched about an 1". The slip material can be rotated so that the duct can fit inside, outside or both on the vent. I wouldn't buy a punch for just one joint.
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Old 08-16-2020, 09:34 AM   #3
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Re: Connecting 3 1/4" x 10" Stack duct to exhaust vent


Thank you for your advice.

I know little about HVAC sheet metal ducting. I tried to look up button punch tool and don't see how that would be used for this. You did give a solution that doesn't need this tool and I'm trying to make sure I understand that.

Are you saying i should use the slip (s cleat) only, say on the long (10") sides then for the 3 1/4" sides just screw those into the "tailpipe" of the vent and tape?

I think I understand what you mean about notching the corners, sort of like preparing it for the slip and drive cleats, except the drive sides won't be bent back?
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Old 08-16-2020, 09:50 AM   #4
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Re: Connecting 3 1/4" x 10" Stack duct to exhaust vent


Quote:
Originally Posted by In Ontario View Post
Are you saying i should use the slip (s cleat) only, say on the long (10") sides then for the 3 1/4" sides just screw those into the "tailpipe" of the vent and tape?

That will work. I would try to get the narrow sides into s lock too. If that proves difficult you can just do the longer sides as you've stated.
The "button" locks the duct and/or vent into the s lock, kind of snaps together. It's not necessary for your project.


Quote:
Originally Posted by In Ontario View Post
I think I understand what you mean about notching the corners, sort of like preparing it for the slip and drive cleats, except the drive sides won't be bent back?

Yes, you've got it.

Last edited by 57TinkerMan; 08-16-2020 at 09:53 AM.
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Old 08-17-2020, 08:54 AM   #5
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Re: Connecting 3 1/4" x 10" Stack duct to exhaust vent


Thank you very much.
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