From where must combustion air be drawn for gas appliances in bedrooms?

Combustion air for gas appliances in bedrooms must be drawn from outdoors to ensure safety and proper operation of the appliances. The primary reason for this requirement is to prevent the accumulation of harmful gases, such as carbon monoxide, which can result from incomplete combustion.

When combustion air is sourced from outdoors, it guarantees that the supply of air is fresh and that sufficient oxygen is available for the appliances to function efficiently. Drawing air from indoors, especially in a confined space like a bedroom, can lead to reduced air quality and increased risk of backdrafts, which can draw combustion gases into the living space.

Inadequate ventilation from sources like adjacent rooms, attics, or basements can lead to various safety issues. For instance, adjacent rooms may not provide enough air, while attics might not have a consistent air supply and can expose appliances to unconditioned air. Similarly, basements can contain moist air or harmful gases, making them unsuitable for combustion air intake.