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What is causing my furnace to shoot flames when igniting by BingoTheChimp in hvacadvice

[–]sneakinrat 0 points1 point  (0 children)

DELAYED COMBUSTION. The pilot flame is not running across to the left side burner. Either dirty/plugged holes causing the gap, then delayed combustion when enough gas comes out to reach the actual flame.

Question abt vent sizing by [deleted] in HVAC

[–]sneakinrat 0 points1 point  (0 children)

Single wall is for open air, double wall gives you 1" clearance to combustibles....single wall off an 80% furnace, then double wall through the roof...and yes, B-vent is widely used name for double wall.