This Filter Hut Accumulair brand 18x18x4 air filter is exactly designed to be a replacement for similarly sized 18x18x4 air filter style. Pleated electrostatically charged filter material traps contaminants in the air according to the ASHRAE MERV specification. Chemical free. Notice: Example filter picture as shown is not the actual dimensions and is shown for design purposes only. Database and 18x18x4 air filter variations last verified on 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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