Actual size is 20.75 x 20.75 x 4.38. Accumulair brand: 21x21x4.5 Rheem PD540018 style whole house filters, specifically constructed to replace the OEM Rheem PD540018 air filters. Completely box-formed - no forming or combs needed. MERV graded to ASHRAE ratings ensuring function to the level of the original brand Rheem PD540018 air filter. Photo: The sample filter image displayed is not the actual dimensions and is displayed for configuration purposes. OEM names and Rheem PD540018 P/N displayed for air filter replacement identification purposes only.
Shipping and Returns
- Our current lead times are 6-8 business days for standard filters (1"-6" thick sizes), and up to 10-14 business days for made-to-order filters (non-standard and 0.5" sizes). Delivery normally takes another 1-3 days depending on location.
- Shipping is FREE to the contiguous United States.
- 30-day 100% return policy.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.