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Thank you, i will swap the 3/4 rigid with csst to eliminate elbows

About 12' 3/4" with 4 elbows. It comes off a 1 inch line with 20 feet to meter and 2 elbows

The gas supply is 3/4", and only the water heater and furnace use gas. It started this befor the furnace was turned on for the winter I have checked for obstructions and see nothing

Will take pictures later, attaching a drawing of how its installed. What are some of the issues that could cause the problem I have described? Why would the blower slow down when I open more hot water points? Venting installed is pretty straight forward, I also left the old pvc exhaust vent from...

It is the first section of stainless exhaust vent coming out of the unit, back draft damper and condensate catcher. (nova vent 2nvvd4)

I have recently installed a tk4-in-ng Worked great for two weeks and then ended up shutting down and giving the error code 991 for abnormal combustion I reset it and it does ok a for a couple weeks then does the same thing I have adjusted the back draft damper because I noticed an unusal...