Furnace will work ok for 15-20 mins good flame ( NG) then flame will go very low, blower will stay on but no heat. If you shut it down and back on it will do same thing, had gas co check pressure- Ok
Bryant MODEL 349HAV Nat Gas Furnace
If the gas pressure is good on inlet and outlet of valve u might wanna chk the burner trays and manifold for flakes, dirt, spider webs ect... once u kno the passages are clear from obstruction you can focus on the mechanical. (sounds like gas valve may be getting weak and not able to open fully)
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what are the first four digits of the serial #
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