This air filter is made to a 31 x 22-1/2 x 1 nominal size for HVAC systems, air handlers, and return grilles that require an exact custom dimension rather than a standard retail size.
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.
At MERV 13, this filter removes a significantly larger share of fine particulate from your return air than standard mid-efficiency ratings including smoke, bacteria-sized particles, and the fine dust that tends to resettle faster after cleaning. Because the media is denser, a properly sized HVAC system matters: check your blower’s static-pressure headroom before upgrading.
Specifications
- Nominal size: 31 x 22-1/2 x 1
- Actual dimensions: 31 x 22-1/2 x 3/4
- Efficiency rating: MERV 13
- Quantity: 12 filters per carton
Common applications for a 31 x 22-1/2 x 1 custom filter include retrofit installations, legacy HVAC systems installed before standard sizes were codified, built-in return grilles that were framed to non-standard dimensions, and commercial unit housings that don’t match any current off-the-shelf size.
Features
- Sold as a 12-pack so you have a full year of replacements on hand
- Cardboard frame with reinforced media for structural stability during handling and installation
- Orientation arrow printed on the frame to ensure correct airflow direction at install
- Made to your exact 31 x 22-1/2 x 1 specification no trimming or taping required at installation
Same 31 x 22-1/2 x 1 size, different efficiency rating
| MERV 1-4Basic dust-stop | MERV 8Standard efficiency | MERV 11Enhanced efficiency |
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Need 31 x 22-1/2 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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