(800)865-5931 Closed Thur 11/26 - Sun 11/29, Reopen Mon 11/30 8am, CT
Free Shipping See Details
No Sales Tax See Details
Enter your zip for personalized product and service recommendations.

Alpine SBFD30-100-244

30 Inch Wide Return Air Support Box and Plenum Kit With Filter Slot

(3 Reviews)


    • Shipping to Canada

      Canadian tax and shipping fees may be estimated prior to purchasing an item by completing the form below.

      Duties (%): N/A
      Canada Tax (%): N/A
      Brokerage: N/A
      Total taxes: N/A
      Quantity: Postal Code:

This return air support box and plenum kit is for use with systems where the return air must come in underneath the furnace or air handler. The kit includes 8 feet of 24 inch by 8 inch sheet metal ductwork that can be custom trimmed to the correct height for most applications, and a support box that can hold a furnace or air handler up to 22 inches wide. The support box features an interior support bracket for maximum strength, and a 20 by 25 inch filter slot that can accommodate a one, four, or five inch thick media filter. This kit does not include a filter. Please  click here to see our recommended filter. For return air box only, please see the Snappy SBFD30 .

Filter Size
20 x 25 Inches
Support Box Dimensions
30W x 28D x 15H inches
Duct Size
8 x 24 inches
Use Media Filters of Thickness
1 / 4 / 5 inches
Duct Length
8 ft
Max Furnace or Air Handler Width
22 inches
15 Inches