Actual Size: 16.63 x 26 x 4.13. Accumulair brand: 17x26x4 Lennox X6664 substitute whole house filters, specifically engineered to substitute for the OEM Lennox X6664 filters. Fully box-formed - no forming or combs required. MERV rated to ASHRAE grades ensuring filtration equal to the OEM Lennox X6664 air filters. Notice: Example filter image as displayed is not the actual dimensions and is displayed for construction only. Trade names and Lennox X6664 part numbers used for air filter style purposes. Current stock and statements last verified on 03/29/2020.
Shipping and Returns
- Shipping is FREE to the contiguous United States.
- Orders take 1-3 business days to process.
(Custom & bag filters take 5-7 business days.)
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.