Goodman Furnace: Vent termination heights and sealing
Vent termination heights and sealing on a Goodman furnace: Heights and sealing for vent and combustion air terminations. Applies to roof and wall. Snow burial and poor seals are the usual faults.
Applies to: Vent/flue and combustion air terminations
Common causes of vent termination heights and sealing
- Termination below snow level
- Unsealed roof or wall penetration
- Coupling and pipe length wrong in wall
- Pipes in different pressure zones
How to fix vent termination heights and sealing: step by step
- Terminate at least 12 in above the highest anticipated snow level.
- Keep the horizontal termination at least 12 in from grade or snow level.
- Seal a roof penetration tight with proper flashing, like a plastic plumbing vent flashing.
- For a horizontal wall penetration, install a coupling on each side of the wall and solvent cement a pipe between them. Pipe length equals wall thickness plus socket depth of both fittings.
- Seal the wall penetration with silicone caulk.
- Terminate both pipes in the same pressure zone (same roof side, no major obstacles between pipes).
- Run a cycle and check the seals.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service manual, p. 16. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.