Description
Exact Filters® produces this 39-3/8 x 21-5/8 x 1″ filter to your measurements, so instead of trimming, taping, or forcing a “close enough” size into place, you drop in a filter that fits your 39-3/8 x 21-5/8 x 1″ slot the first time.
Filter bypass — air slipping past a loose frame instead of through the pleats — is one of the most common reasons a filter underperforms its MERV rating in the real world. A precise fit closes that gap.
MERV 13 targets the fine particulate fraction that lower MERV ratings allow through — including smoke, bacteria-carrying dust, and combustion byproducts. Airflow resistance is higher than MERV 8 or 11, so systems with borderline static pressure should be evaluated before switching up.
Specifications
- Nominal size: 39-3/8 x 21-5/8 x 1″
- Actual dimensions: 39-3/8 x 21-5/8 x 3/4″
- Efficiency rating: MERV 13
- Quantity: 12 filters per carton
The 39-3/8 x 21-5/8 x 1″ dimension is one of the many non-standard sizes we make on demand, serving both retrofit installations in older homes and light-commercial properties where the return housing dates to an older era of HVAC construction.
Features
- Made to your exact 39-3/8 x 21-5/8 x 1″ specification — no trimming or taping required at installation
- Suitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems
- Orientation arrow printed on the frame to ensure correct airflow direction at install
- Replace approximately every 90 days in standard installations; shorter intervals in high-dust, smoky, or heavy-use environments
Same 39-3/8 x 21-5/8 x 1″ size, different efficiency rating
| MERV 1-4Basic dust-stop | MERV 8Standard efficiency | MERV 11Enhanced efficiency |
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Need 39-3/8 x 21-5/8 x 2″ or another depth? This size is available in other depths we don’t stock online — reach out and our team will quote it for you, typically same business day.
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