Foamed insulation at furnace

[Greg Frazier]

Found this today. It appears to be expanding foam used to seal the chimney. It was painted to match the wall. I called it out as improper material. Does anyone know if any of this stuff is high temperature suitable? I know the orange stuff can be used in garages to seal firewalls, but this was yellow foam. Also noted that the water heater is not venting above the furnace vent.

[Jerry Peck]

If that is Type B gas vent, which it should be, the insulation needs to be kept back 1" minimum ... regardless of any temperature rating of the foam insulation.