This Accumulair 21x23x4 air filter is exactly designed to be compatible with similarly sized 21x23x4 air filter type. Pleated electrostatic charged filter media captures contaminants in the air according to the MERV standard specification. Material is free of chemicals. Note: Sample filter picture shown is not the actual dimensions and is displayed for design purposes only. Database and 21x23x4 air filter specs current as of 03/24/2020.
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.
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