Gas Fireplace Exterior Wall Exhaust

Hello HIs

Photo of exterior wall, gas fireplace exhaust.

Need assistance in wording this one. Looks like this exhaust is a newer install, there is terminated opening below it from a previous exhaust.

Thanks to all contributions.

2006 International Residential Code for One and Two Family Dwellings
Part V- Mechanical
Chapter 18 Chimneys and Vents
Section M 1804 Vents

M1804.2.5 Direct vent terminations.
Vent terminals for direct-vent appliances shall be installed in accordance with the manufacturer’s installation instructions.

M1804.2.6 Mechanical draft systems.
Mechanical draft systems shall be installed in accordance with their listing, the manufacturer’s installation instructions and, except for direct vent appliances, the following requirements:

  1. The vent terminal shall be located not less than 3 feet (914 mm) above a forced air inlet located within 10 feet (3048 mm).

  2. The vent terminal shall be located not less than 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from, or 1 foot (305 mm) above any door, window or gravity air inlet into a dwelling.

  3. The vent termination point shall not be located closer than 3 feet (914 mm) to an interior corner formed by two walls perpendicular to each other.

  4. The bottom of the vent terminal shall be located at least 12 inches (305 mm) above finished ground level.

  5. The vent termination shall not be mounted directly above or within 3 feet (914 mm) horizontally of an oil tank vent or gas meter.

  6. Power exhauster terminations shall be located not less than 10 feet (3048 mm) from lot lines and adjacent buildings.

  7. The discharge shall be directed away from the building.

Unit definitely needs servicing as it is burning without complete combustion thus creating the soot. Since the unit appears to be a direct vent with combustion air supply, manufacturer’s instructions will most likely take precedent over the local codes.

Check the required distance from top of vent to combustibles.


In my area we just transferred to the 2009 IRC. You might want to check your area since some changes have been made.