Shop By

Plenums & Filter Boxes

3 Items

per page
Set Descending Direction

3 Items

per page
Set Descending Direction
Filter Results

A plenum creates the transition between your furnace and you. For example, a supply air plenum box helps with the heat transfer from the furnace to the ductwork, and eventually to the rooms. The plenum actually becomes a heat source, as it is warmed by air from the furnace and extends the warmth as air continues through the ductwork.

While in a traditional AC system, the air handler and ductwork are out of sight, they should not be out of mind. It’s crucial that everything attached to the ductwork is efficient, leak-proof, and appropriate for the duct size and airflow direction.


Whether you need an air conditioner downdraft plenum, a downdraft furnace plenum, or an updraft plenum, get the right part for the job that is fitted properly to the component or ductwork. They are made from lightweight (for quick heat transfer) material that is easy to work with during installation.

Furnace Adapter Kit Coils

A furnace coil adapter kit transitions between mismatched components and ensures that heat transfer is accomplished seamlessly without air loss and without adding stress to the blower motor. Determine your measurements on both components before ordering.

Filter Boxes

Sometimes referred to as filter racks, these devices hold the filter(s) that keep your system at peak performance. As with plenums and other components, they must fit tightly into the ductwork, yet still allow for easy removal/replacement of the filters.

High Temperature Drain Pans

Available in a number of sizes, high temperature drain pans convert standard upflow systems to high heat applications. These safely collect condensation and aid in the discharging of it into the drain system.

Square to Round Adapters

Transition from traditional square ductwork to flexible ductwork with a set (usually 2) of these adapters. has over 8,000 verified customer reviews at an average rating of 4.8 out of 5 stars. Contact us today with any questions!

Customer Reviews