Airfilters.com is located in Southern Alabama. We offer over 214 standard sizes available in 1 2 4 and 6 pleated air filters as well as custom sized air filters. Custom size air filters and standard size air filters are a pleated 90 day filter offered in different efficiencies. We offer custom size air filters for 1 2 4 and 6. Custom Filters are made to your exact specifications. Airfilters.com is located in Southern Alabama. We offer over 214 standard sizes available in 1 2 4 and 6 pleated air filters as well as custom sized air filters. Custom size air filters and standard size air filters are a pleated 90 day filter offered in different efficiencies. We offer custom size air filters for 1 2 4 and 6. Custom Filters are made to your exact specifications.