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Re: direct vent exhaust blistering paint

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Posted by Dan on April 25, 2010 at 10:57:08:

In Reply to: Re: direct vent exhaust blistering paint posted by Heatpro on April 23, 2010 at 14:32:06:

I found a label on the exhaust pipe that comes from the boiler. It is made by FasNSeal and is FVL3605. I think that means that it is single wall? Looking under the joists where the pipe passes just before it heads out the side wall, there is a galvanized shield that is screwed to the joists and subfloor. It is very rusty.
Also, on further inspection, the shingles next to the pipe where it comes through the wall are the consistency of burned toast. I can scrape the blackened pieces with my fingernail.
I had been looking the the clearance from the basement side, but when I removed the exterior flange, the outer pipe Which has insulation between it and the inner pipe, is right up against the siding.
The exhaust for the boiler travels vertically for about 5 feet before turning horizontal and existing the side wall (another 4-5 feet). If the FSVL3605 is indeed single wall, can I leave most of it in place and switch to double wall as it exits the side wall? In other words, can I attach double wall by the same company to my existing single wall? I would think that that would fix the problem as I would leave it inside the fiberglass insulated shield which is screwed to the plywood.

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