Plenums & Filter Boxes

Find high quality furnace plenum kits, furnace filter boxes, and ductwork accessories at the best online source for HVAC equipment & parts. If you’re building or replacing your HVAC system or your ductwork, don’t underestimated the importance of a quality parts and accessories. We offer the best brands and inventory with wholesale pricing and fast shipping.

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  • Filter Rack - 16" x 25" x 1"

    Filter Rack - 16" x 25" x 1"

    Model: FR1625-1
    Low Price: $36.00
  • Filter Rack - 20" x 25" x 1"

    Filter Rack - 20" x 25" x 1"

    Model: FR2025-1
    Low Price: $42.00
  • High Temperature Drain Pan - 14" Wide

    High Temperature Drain Pan - 14" Wide

    Model: HTP-A
    Low Price: $69.95
  • High Temperature Drain Pan - 17.5" Wide

    High Temperature Drain Pan - 17.5" Wide

    Model: HTP-B
    Low Price: $82.95
  • Goodman Square to Round - Horizontal

    Goodman Square to Round Adapters - Horizontal - Qty 2

    Model: SQRPCH101
    Low Price: $88.00
  • 14" to 17.5" Furnace to Coil Transition

    14" to 17.5" Furnace to Coil Transition

    Model: SST-AB-R6
    Low Price: $94.95
  • Goodman Square to Round - Horizontal

    Goodman Square to Round Adapters - Horizontal - Qty 2

    Model: SQRPCH102/103
    Low Price: $97.00
  • Goodman Square to Round - Horizontal

    Goodman Square to Round Adapters - Horizontal - Qty 2

    Model: SQRPGH103
    Low Price: $99.00
  • High Temperature Drain Pan - 24.5" Wide

    High Temperature Drain Pan - 24.5" Wide

    Model: HTP-D
    Low Price: $99.95
  • High Temperature Drain Pan - 21" Wide

    High Temperature Drain Pan - 21" Wide

    Model: HTP-C
    Low Price: $102.95
  • Filter Rack - 20" x 25" x 1"

    Internal Horizontal Filter Rack for Goodman Packaged Units

    Model: DHZIFRPGCHA
    Low Price: $108.00
  • Goodman Square to Round - Horizontal

    Goodman Square to Round Adapters - Horizontal - Qty 2

    Model: SQRPGH101/102
    Low Price: $110.00
  • 17.5" to 21" Furnace to Coil Transition

    17.5" to 21" Furnace to Coil Transition

    Model: SST-BC-R6
    Low Price: $114.95
  • Knockdown Plenum with Top - 13.5" x 20.5" x 36"

    Knockdown Supply Plenum with Top - 13.5" x 20.5" x 36" - A Width

    Model: 70G36H
    Low Price: $116.95
  • Knockdown Plenum with Top - 16.5" x 20" x 36"

    Knockdown Supply Plenum with Top - 16.5" x 20" x 36" - B Width

    Model: 74G36H
    Low Price: $116.95
  • AirQuest Furnace Combustible Floor Base

    Downflow Furnace Installation Kit

    Model: NAHA01101SB
    Low Price: $119.95
  • Knockdown Plenum with Top - 20" x 20" x 36"

    Knockdown Supply Plenum with Top - 20" x 20" x 36" - C Width

    Model: 80G36H
    Low Price: $128.95
  • 21" to 24.5" Furnace to Coil Transition

    21" to 24.5" Furnace to Coil Transition

    Model: SST-CD-R6
    Low Price: $129.95
  • Furnace Return Air Box with Filter Rack - 24.5" x 28.5"

    Furnace Return Air Box with Filter Rack - 24.5" x 28.5"

    Model: FB2428
    Low Price: $134.00
  • Furnace Return Air Box with Filter Rack - 14.5" x 28.5"

    Furnace Return Air Box with Filter Rack - 14.5" x 28.5"

    Model: FB1428
    Low Price: $135.00
  • Southwark FB1728 Return Air Box - 17.5" x 28.5"

    Furnace Return Air Box with Filter Rack - 17.5" x 28.5"

    Model: FB1728
    Low Price: $144.00
  • AirQuest 4" Chimney Kit - NAHA00401DH

    AirQuest 4" Chimney Kit

    Model: NAHA00401DH
    Low Price: $147.00
  • Furnace Return Air Box with Filter Rack - 21.5" x 28.5"

    Furnace Return Air Box with Filter Rack - 21.5" x 28.5"

    Model: FB2128
    Low Price: $149.00
  • Knockdown Plenum with Top - 24.5" x 20" x 36"

    Knockdown Supply Plenum with Top - 24.5" x 20" x 36" - D Width

    Model: 90G36H
    Low Price: $149.95

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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.

Plenums

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. HVACDirect.com has over 8,000 verified customer reviews at an average rating of 4.8 out of 5 stars. Contact us today with any questions!

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