FURNACE RETURN AIR BOOT

Custom Return Air Boots — Furnace & Air Handler Connections

Return air boots are specialized fittings that connect the return air grille or duct to the furnace or air handler’s return air opening. Unlike standard duct fittings, return boots are designed to handle the negative-pressure side of the system where air is being pulled back to the unit. Our return boots are fabricated from galvanized steel for durability and corrosion resistance in the condensation-prone return air environment.

Filter Slot Option

The optional filter slot integrates a 1" filter rack directly into the return air boot, eliminating the need for a separate filter grille or rack. This is the ideal location for filtration in systems where the furnace does not have an internal filter slot. The built-in slot accepts standard 1" pleated or fiberglass filters and provides a tight seal to prevent bypass air.

Turning Veins for Improved Airflow

Return air boots typically involve a 90-degree turn from the wall or floor grille to the horizontal or vertical return duct. Without turning veins, this abrupt turn creates significant turbulence, noise, and pressure drop. Our optional turning veins redirect airflow smoothly through the turn, reducing pressure loss by up to 50% and significantly lowering return air noise—particularly important for bedrooms and living areas near the furnace.

Installation Considerations

Return boots are sized to match standard return grille openings and furnace return air connections. For optimal performance, the return boot should be sized to maintain return air velocity below 600 FPM to minimize noise. In humid climates, the galvanized construction prevents condensation-related corrosion that can degrade uncoated sheet metal on the return side of the system.