Build Custom Air Filters for Commercial and Institutional Systems

Facility HVAC systems vary. We make filter to match.

Factory Filters Direct builds custom size air filters for labs, schools, hospitals, rental properties, and large facilities that require precise airflow control and dependable indoor air quality.

How to measure your filter
StepEnter your filter dimensions (actual) x x

StepSelect your performance rating

Additional Info

Nominal Depth 1”
Actual Depth 3/4”
Nominal Depth 2”
Actual Depth 1 3/4”
Minimum Size
5” x 5”
Maximum Size
40” x 40”

Please Note: Due material limitations used to build a custom filter, we construct a double filter (two filters fused together) when any filter dimension is larger than 24.75” on both sides and or larger than 29.75” on one side. Please allow up to an additional five (5) business days for processing your custom filter order.

Custom filters are not eligible for return or refund.

Why Facilities Choose Factory Filters Direct

Engineered for Performance

  • Made to fit non-standard and legacy HVAC units
  • High-efficiency pleated media and rigid frames
  • Consistent performance you can plan maintenance around

Wholesale Value

  • Factory-direct pricing on case quantities
  • Streamlined reordering for maintenance teams
  • Reliable lead times and nationwide shipping

Trusted by: laboratories, hospitals & clinics, schools & universities, rental property owners, commercial and municipal facilities.