Actual Dimensions: 20 x 20.63 x 4.38. Accumulair brand 20x21x5 Lennox X8790 replacement whole house air filters, specifically built to substitute for the original brand Lennox X8790 air filters. Fully built so no assembly or combs required. MERV classified to ASHRAE 52.2 test specs establishing particulate filtration equal to the original manufacturer Lennox X8790 air filters. Notice: Example air filter picture as shown is not true to size and is shown for design purposes only. Name brands and Lennox X8790 part numbers are shown for air filter substitution identification purposes only.
Shipping and Returns
- Shipping is FREE to the contiguous United States.
- Our current lead times are 3-5 business days for stocked filters (standard 1"-5" thick sizes), up to 3 weeks for made-to-order filters (non-standard and 0.5" sizes).
Delivery normally takes another 1-3 days depending on location.
- 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.