Are undercut doors allowed for return air movement in non-engineered systems?

Undercut doors can indeed be permitted for return air movement in non-engineered systems. This practice allows for the unobstructed flow of air between rooms or from a space back to the HVAC system, which is essential for maintaining balanced air pressure and ensuring efficient ventilation.

In homes or buildings without engineered design specifications, undercut doors facilitate the movement of return air without the need for complex ductwork or fixed return air grilles. This is particularly important in residential settings where maintaining air circulation can directly impact comfort levels and air quality. The height of the undercut typically allows enough space for air to flow underneath while still providing some level of privacy and security.

In some instances, local codes may have specific requirements for door undercuts, such as minimum heights or guidelines regarding the type of flooring, but generally, the practice is acceptable for facilitating air movement. Understanding this principle is important for properly managing airflow in a mechanical system, especially in applications where engineered solutions are not in place.