Exact Filters 37-1/4″ x 21-7/8″ x 1″ Pleated MERV 13 Whole-House Filter (12-Pack)

Description

Exact Filters® produces this 37-1/4 x 21-7/8 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 37-1/4 x 21-7/8 x 1″ slot the first time.

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.

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: 37-1/4 x 21-7/8 x 1″
• Actual dimensions: 37-1/4 x 21-7/8 x 3/4″
• Efficiency rating: MERV 13
• Quantity: 12 filters per carton

Customers typically order a 37-1/4 x 21-7/8 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 37-1/4 x 21-7/8 x 1″ specification — no trimming or taping required at installation
• Pleated construction (or fiberglass, depending on MERV tier) designed for balanced capture and airflow
• Replace approximately every 90 days in standard installations; shorter intervals in high-dust, smoky, or heavy-use environments
• Suitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems

Same 37-1/4 x 21-7/8 x 1″ size, different efficiency rating

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