Measuring Draft On Double Wall Pipe With Baro Damper

[velvetfoot]

I've seen numerous threads in the past on measuring draft, but I don't have the time right now to go through them all again. I have DVL double wall pipe out of the boiler going to a baro damper. Do I have to drill a hole through the double wall pipe? If so, how would I seal both layers afterwards? Can I just stick the probe down the upstream side of the baro damper?

As I recall, I've seen the permanently mounted Dwyer liquid models, Magnehelic, and digital models. I saw a digital model on Amazon for 60 bucks.

Is there usually a need for a permanently mounted unit?

Thanks for any help. Must get back down to basement.

 

[Highbeam]

There would be no reason to reseal the test hole in the outer layer. Make your outer hole large enough to fit the head of a screw past it when putting a screw in the hole to seal the inner layer. You could always leave the mano permanently mounted.