Seaming Flexible "Canvas" Duct Connectors

[wwhitney]

I've got a rectangular flexible duct connector, like you use at equipment for vibration isolation, such as this one:

https://www.menards.com/main/heating-cooling/ductwork/ductwork-fittings/canvas-connector-duct-fitting/08624080rb/p-1444432217351-c-14260.htm

However, the black fabric section is just lapped at two of the corners, I can stick my finger between the two layers. What's the proper way to glue the "vinyl-coated woven nylon/polyester" to itself? I've seen a suggestion of rubber cement, would that actually work?

Cheers, Wayne

 

[John Gayewski]

Do you have access to the inside of the duct?

 

[Sponsor]

 

[wwhitney]

Do you have access to the inside of the duct?

Yes, I'm in the middle of replacing some sections. I needed to make access to change the slim duct air handler ECM motor, and I'm adding the canvas connector as I used to have some resonance at one fan speed (although it could have been just the motor, not sure). In case it matters, the duct is 8x24 as in the link.

Thanks, Wayne

 

[Breplum]

Hey Wayne,
I haven't had my hands on flex duct connectors for a few years, but think that any good mfr wouldn't have that kind of issue.
"Duct sealant" fiber reinforced, should do the trick. The closest supplier might be Rubenstein Supply in Oakland. Or if you only need small quantity, a caulk tube is available.

 

[John Gayewski]

I was gonna suggest you find a compatible glue for the chemistry of the material and make a patch (out of like material) from the inside. I would think trying to glue it shut would be futile after a few cycles. But as far as the correct product I'm not sure I've ran across this. I might try literally sewing a patch in, but by then it might be better to replace it. I work side by side with hvac guys very regularly but generally they are replacing something.

 

[Fitter30]

DuroDyne

YouTube videos has some vidios on it.