The RXHF OEM Filter Bases are for residential air handlers (upflow with hinged door)

Technical Data For RXHF-21 :

• Universal fit filter base for most other brands.
• Typical Application: Upflow - Electric
• Insulation : YES
• Door Opening On: 21 Side
• Housing Overall (Outside) Dimensions Width (in.): 21
• Housing Overall (Outside) Dimensions Length (in.): 21
• Housing Overall (Outside) Dimensions Height (in.): 3-5/8
• Air Opening Inlet Dimensions Width (in.): 19-1/4
• Air Opening Inlet Dimensions Length (in.): 19-1/2
• Air Opening Outlet Dimensions Width (in.): 19-1/4
• Air Opening Outlet Dimensions Length (in.): 19-1/2
• Number of Filters per Unit: 1
• Replacement Media Thickness (in.): 1 or 2
• Replacement Media Dimensions - Nominal (in.): 20 x 20
• Replacement Media Dimensions - Actual (in.): 19-9/16 x 19-9/16
• Duct Configuration: Through
• Door Type: Hinged