The Uline S‑25638 is a pleated air filter designed for residential or light commercial HVAC systems. It is nominally 20″ × 20″ × 2″ in size and is used to trap dust, lint, and particulate contaminants from the air stream, helping to protect HVAC equipment and improve indoor air quality.

Key features include:

A pleated design that increases the surface area of the filter media, allowing it to capture more dust before needing replacement.

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A moisture‑resistant paperboard frame with diagonal supports and wire reinforcement for structural strength and rigidity.

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The filter is classified under UL / C‑UL (i.e. conforms to UL 900 and ULC S111 standards), indicating it meets safety, flammability, and structural criteria.

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It is made with 100% non‑woven synthetic media, which offers consistent performance and durability.

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The Uline listing shows it is sold in cases of six, with each filter priced (per unit) at $15.75 when purchased by the case.

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