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problem?
I'm already calling out this furnace install but wanted to see what you guys think of this....
New construction, forced air gas furance - gas water heater exhaust joins a couple feet up the furance flue.
First questionable thing is the junction is a 90 degree 'T' and the furnace venting is perfectly vertical, meaning the water heater vent pipe has no slope as it joins the furance exhaust. When I fired the furance it didn't start but the induction fan did. When the water heater firing with this induction fan all (or a good portion) of the exhaust from the water heater was back drafting into the garage. Now, I can't say I've ever checked the drafting of the water heater with ONLY the induction fan running but is this at all normal to have backdrafting, even only temporary (as it would be if the furance actually fired)??
The use of the 'T' fitting really just seems wrong. To me it seems as though the installer planned to just barely meet the standard right from the start. There was plenty of room to elevate the water heater venting more and join the furance vent with a more favorable junction piece. Honestly, I'm not up to date on all of the precise venting codes but from what I have learned this is just not right... Anyway, there's a picture below.... I'd love to hear any thoughts... thanks!
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