shop heater intake/exhaust question - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 11-07-2016, 10:52 AM Thread Starter
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shop heater intake/exhaust question

I am installing a Space-Ray cold blocker radiant series heater in my three car garage (woodshop in third stall). Location is Minnesota.

I have decided to run a second vent for the combustion which will run through a concentric kit along with the exhaust gas. I figured I would eliminate or reduce long term maintenance with dusty conditions.

My question is do I need to insulate the intake pipe? Will the concentric kit be enough to warm the intake to eliminate condensation? If yes, insulate the entire way to the control box or just a 4 ft section?

Note, both exhaust and intake are horizontal going through the wall vs. vertical through the roof. Both runs will be about 25 ft with one 90 degree elbow.
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post #2 of 5 Old 11-07-2016, 04:21 PM
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Question: Are you having an open flame with dusty conditions? Concerned.

A diamond is how coal reacts under pressure.
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post #3 of 5 Old 11-08-2016, 08:14 AM Thread Starter
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Technically yes, but that is why I am running a fresh air intake to the outside and not using air from the inside of the garage. The control/fire box is contained, only incoming air will be from the vent to the outside.
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post #4 of 5 Old 11-08-2016, 10:21 AM
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I don't think the dust in a typical wood shop would be concentrated enough to be at risk for combustion, especially in a 3 car garage area. I think your plan seems fine. I would insulate the first few feet just to be safe. Granted, I am not even remotely qualified to make such a claim. Just my reckoning of the situation.
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post #5 of 5 Old 11-08-2016, 10:49 AM
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This is opinion, based on looking at videos about concentric intake/exhaust systems and my own 57 years of experiences ... it appears there is only need for the one concentric pipe.
Intake air is pulled in through the outer pipe, which cools the exhaust while heating the intake. If you're using the PVC of the video, there shouldn't be enough condensation on the outside to worry about.

With a 25' run, I suppose it would be somewhat possible to have the exhaust tube too cool, by the time you get to the wall to the outside, to warm the intake air. You might get some distance of cold air coming through, and a little condensation. Only then, would I worry about insulating. And you'll also know how far it's required.

I am not sure if this is what your talking about, though. It sounds as if you're actually running THREE pipes. One that will be the concentric pipe of two, and a third pipe. I am unsure of your intent.
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