When there is a risk of snow accumulation, how many inches should the vent pipe height be increased?

Increasing the height of vent pipes is crucial in areas that experience heavy snowfall to prevent blockages caused by snow accumulation. The standard recommendation is to raise the vent pipe by a specific number of inches above the expected snow level to ensure proper ventilation and prevent the pipe from being buried, which could lead to a buildup of harmful gases or lack of air exchange.

Raising the vent pipe by six inches is generally considered sufficient to account for typical snow depth and to minimize the risk of obstruction. This height allows for adequate clearance above the snow, reducing the chances of the vent becoming blocked during winter months when snowfall can be significant. Ensuring that the vent is elevated this much is part of maintaining the overall safety and functionality of the home's ventilation system.

Other options might increase the height by lesser or greater amounts, but six inches strikes a balance that caters to common snowfall conditions while maintaining the integrity of the ventilation system.