When your HVAC system calls for a 31-3/4 x 25-7/8 x 1 filter and the standard aisle doesn’t carry it, this Exact Filters unit is cut to your exact 31-3/4 x 25-7/8 x 1 spec no shims, no gaps, no bypass air.
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: 31-3/4 x 25-7/8 x 1
- Actual dimensions: 31-3/4 x 25-7/8 x 3/4
- Efficiency rating: MERV 13
- Quantity: 12 filters per carton
The 31-3/4 x 25-7/8 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
- Sold as a 12-pack so you have a full year of replacements on hand
- Suitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems
- Replace approximately every 90 days in standard installations; shorter intervals in high-dust, smoky, or heavy-use environments
- Pleated construction (or fiberglass, depending on MERV tier) designed for balanced capture and airflow
Same 31-3/4 x 25-7/8 x 1 size, different efficiency rating
| MERV 1-4Basic dust-stop | MERV 8Standard efficiency | MERV 11Enhanced efficiency |
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Need 31-3/4 x 25-7/8 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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