exhaust and intake vents

Old 09-16-12, 08:03 AM
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exhaust and intake vents

In 95%eff. 2 stage both exhaust and intake vents are 2 inch pvc.How about 95% 1 stage is exhaust vent pvc or is it sheet metal tapping in to existing sheet metal chimney?
Old 09-16-12, 08:51 AM
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anything above 90% efficient uses pvc for the flues. This is due to the low flue gas temps and condensate collected in the flues.

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