Description
When your HVAC system calls for a 40 x 39-3/4 x 1″ filter and the standard aisle doesn’t carry it, this Exact Filters® unit is cut to your exact 40 x 39-3/4 x 1″ spec — no shims, no gaps, no bypass air.
A custom-cut filter keeps every cubic foot of return air flowing through the media rather than around it, which is the foundation of any effective filtration setup.
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: 40 x 39-3/4 x 1″
- Actual dimensions: 40 x 39-3/4 x 3/4″
- Efficiency rating: MERV 13
- Quantity: 12 filters per carton
Customers typically order a 40 x 39-3/4 x 1″ custom filter because their system is older, was built by a regional manufacturer, was retrofitted, or was framed on-site by an installer who didn’t conform to a standard filter dimension. If that describes your situation, you’re in the right place.
Features
- Made to your exact 40 x 39-3/4 x 1″ specification — no trimming or taping required at installation
- Cardboard frame with reinforced media for structural stability during handling and installation
- Suitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems
- Pleated construction (or fiberglass, depending on MERV tier) designed for balanced capture and airflow
Same 40 x 39-3/4 x 1″ size, different efficiency rating
| MERV 1-4Basic dust-stop | MERV 8Standard efficiency | MERV 11Enhanced efficiency |
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Need 40 x 39-3/4 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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