I have no idea how to handle this toekick duct...

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IdAuHunter

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It's my first post on the HVAC side of things. I'm the first to admit HVAC is out of my lane. The answer may be obvious. But I have no clue how to tackle this.

Situation: Unsure how to handle a 6" supply that fed a toekick register under the kitchen sink base cabinet.

Background: Remodeling my kitchen after a dishwasher leak cause a partial loss. Old cabinets had a toekick register. The was custom fabricated and the water mediation company damaged it beyond repair when they removed the cabinets. I'm laying a 2nd layer of plywood in preparation for tile before the cabinets are installed.

Assessment: It's a 6" 90 degree elbow that comes up through the subfloor. Terminates flush with the subfloor. It will terminate underneath the kitchen sink vanity.

Problem: The cabinet installers said one cost effective option is to caulk the cavity under the kitchen sink base. This would prevent warm air leaking into the cabinet. Then cut out a toekick register.

I'm open to that option but there's a large gap between the subfloor and 6" duct. I don't want warm air pushing back down into the laundry room below. I could block off gap from below easy enough.

However, is there some boot or flange I should be installing over that 6" crimped end? It's held from below with a metal strap. I browsed Home Depot and didn't find any part that would address a situation like this.

I'm at a loss and want to get 2nd opinions before I install the plywood underlayment.

Thanks in advance boys!
 

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WorthFlorida

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Google "6 inch round to rectangular duct transition". They are around in all sorts of configurations usually used for over the range exhaust hoods to vent outdoors. Or take a look at this site. If you have time, make a box with plywood and bring it the the toe kicker. The space around the duct just fill it in with fiberglass, spray foam, etc.
https://www.proremodeler.com/how-build-custom-toe-kick-deflector
 

Terry

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Normally I see those flashed to the floor there. How to describe? For a non metal-head?
I"m pretty sure they make a flat metal piece for that. Or worse comes to worse, cut a nice round hole in plywood, stick that down, and then a metal pipe or 90 that you can insert and then cut strips out that bend over the flooring to secure it.
 
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