Mating B-vent pipe to single wall pipe

[jmarkwolf]

The exhaust port on the back of my new Beacon-Morris BRT045 hanging garage heater is a single wall "stub".

It needs to mate with the double-wall B-vent that goes through the ceiling and the roof.

The inner wall of the B-vent and the "stub" on the heater are exactly the same diameter, so I need to fashion a "sleeve" to fit over both.

I'm finding references on the web that say this "sleeve" has to be aluminum to match the inner wall of the B-vent, and cannot be fastened with stainless screws due to the heat and chemical make-up of the soot being corrosive, and aluminum thickness must be right, etc.

The aluminum inner wall of the B-vent is pretty thin. Can't see it holding screws very well.

Is all this true? Can't galvanized tube work?

I've got a good dimensional match with some galvanized tube but the seam is so thick it will leak like a sieve around the contact area. (See below).

Will "standard" 4" tube fit over the heater stub and the crimped end fit inside the B-vent inner wall?

Any pearls of wisdom from the GJ brain trust?

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[rlitman]

Why not just use single wall aluminum vent tube instead of galvanized?

 

[LS6 Tommy]

You need to get a pair of duct crimpers & reduce the OD of the stub on the heater.


http://www.pexsupply.com/Malco-C6R-C6R-RedLine-Pipe-Crimper-Offset-5-Blade


Tommy

 

[Mr onetwo]

The proper way to do it is with a single wall appliance connector like this...http://www.ameri-vent.com/products/fc-ac/single-wall-appliance-connector not expensive and proper install.

 

[jmarkwolf]

The proper way to do it is with a single wall appliance connector like this...http://www.ameri-vent.com/products/fc-ac/single-wall-appliance-connector not expensive and proper install.

I've been looking for one of those that matches and interlocks with my Selkirk B-vent pipe (called a draft hood adapter) but no luck, except on-line. Maybe I'll just have to order one and suffer shipping costs and delays. I've been reluctant to do so not knowing if that's what will work any better than what I've got.

I did find what Selkirk calls an "adjustable" B-vent, which is nothing more than a piece of B-vent sawed off at one end. You can then trim it to the required length. This is what I did and is in the previous pic. But I still need to "span" the stub on the back of the heater and the inner wall of the B-vent with a "sleeve".