Goodman Furnace: Multiple direct vent furnaces at one termination
Multiple direct vent furnaces at one termination on a Goodman furnace: Multiple direct vent Goodman furnaces on one roof or one side wall. Same clearances as a single unit, per pair. Keep terminals level.
Applies to: Multiple direct vent furnaces
Common causes of multiple direct vent furnaces at one termination
- Adjacent terminations closer than the single-unit clearances
- Exhaust outlets at different elevations
- Air intakes at different elevations, so one furnace pulls in another's flue gas
How to fix multiple direct vent furnaces at one termination: step by step
- On a common roof, keep the same minimum clearances between exhaust and intake terminations of adjacent units as for a single unit.
- On a common side wall, follow the clearance figure in the manual.
- Terminate all exhaust outlets at the same elevation.
- Terminate all air intakes at the same elevation.
- Check the layout against the manual before drilling any holes.
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. 19. 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.