Quick Answer
Venting generator exhaust through a wall is not recommended unless you comply with specific safety standards and codes, such as ASHRAE 135 and NFPA 37. Proper ventilation, wall thickness, and exhaust system design are crucial to ensure safe and efficient operation. Local building codes and regulations should be consulted before attempting to vent generator exhaust through a wall.
Generator Exhaust Safety Guidelines
When venting generator exhaust through a wall, you must ensure that the exhaust gases are properly directed and diluted to prevent accumulation of carbon monoxide (CO) inside the building. A minimum of 10 feet (3 meters) of clear space between the generator and the wall is recommended to prevent backdrafting. A properly sized and installed exhaust system, including a muffler and a suitable vent termination, is also essential.
Ventilation Requirements
ASHRAE 135 recommends that the exhaust system be designed to dilute the CO concentration to less than 25 parts per million (ppm) inside the building. This can be achieved by providing a minimum of 1 cfm (0.05 m3/min) of ventilation per 100 square feet (9.3 m2) of floor area. The ventilation system should be designed to operate continuously during generator operation and should be equipped with a CO alarm to alert occupants of an emergency.
Code Compliance and Design Considerations
NFPA 37 requires that generator exhaust systems be designed and installed in accordance with local building codes and regulations. When venting through a wall, consider the following design factors: wall thickness, insulation, and materials. A minimum of 2 inches (51 mm) of clearance between the exhaust vent and any combustible materials is recommended. Additionally, consult local authorities to determine the requirements for vent termination, chimney size, and other design considerations.
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