Originally Posted By: Kevin McMahon
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Thank you for the comments.
Here’s a pic of the entry into the chimney flue of the HVAC exhaust vent, HVAC combustion air intake and WH exhaust vent in the basement.
Here’s the story. The original furnace heat exchanger which was installed in 1981 went bad (Lennox pulse G14 of which there was a recall of sorts) so a new furnace was brought in to replace the old. This is basically what drew me to start investigating things about the system.
The house is 65 years old, and the new owner has been living there about 2 years.
I asked the tech about side venting, and he said they vented it out the chimney because the chimney was right there (30" away). Otherwise the vent would be sticking out of the front of the house (eyesore and 8’ away from the furnace). I asked him about the exhaust so close to the intake, and he didn’t think it was any problem.
I didn’t ask about two exhausts side by side with one being a combustible plastic though.
I do have a question. I’ve been trying to locate where it says you cannot have two exhaust flues side by side, nor about the type of material required. I was reading the HVAC Code Check book and it shows a “common vent” system with the WH and Furnace sharing a pvc vent via a wye connection. If they can share a common vent, why can’t they go side-by-side up a chimney flue?
The spec shows the FAI can be vented directy, indirectly, vertically or horizontally.
And this home is for a close relative.
ABC Home Inspection, LLC