I have a Trane XR90 propane furnace and my question has to do with venting.
Currently there are two vents on the roof one exhaust the other for incoming. The exhaust vent is about 3ft and the input is 2 ft.
The vents are near a valley formed by the house roof and the garage roof (like a V).
I am concerned about snow build up to cover the input vent.
How much higher can I raise the pipe for both vents?