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Oval Baldwin Filters air filter, matte pleated paper element, metal end caps, 3957 model

Baldwin Filters

Baldwin Filters PA3957 Air Filter Oval 3-5/8 in

SKU CH-548S-WT166

Oval automotive air filter measuring 3-5/8 inches in height and length

  • Oval design fits tight engine bays
  • 3-5/8 in height matches OEM specs
  • Width range 3-25/32 to 4-13/32 in covers multiple applications
  • Baldwin Filters brand trusted by mechanics
  • Element-only construction simplifies replacement

Oval Automotive Air Filter

This Baldwin Filters PA3957 is an oval automotive engine air filter designed to fit compatible vehicle air-intake systems. It serves owners and technicians who need a direct-replacement element for engines that specify this filter profile. The element-only construction means the housing is reused during service.

Fits existing housing dimensions

Installation requires an air-box that accepts an oval element with an outside diameter ranging from 3-25/32 in to 4-13/32 in and a height of 3-5/8 in. The flexible diameter range allows the filter to seat in housings built to either end of that tolerance. No separate sealing gasket is mentioned, so the original housing seal must be intact.

Sustained filtration in daily driving

Under continuous engine operation the filter media traps airborne contaminants while maintaining airflow to the combustion chambers. Service life depends on the dust load encountered on the road rather than a fixed interval. The element is replaced when restriction reaches the level specified by the vehicle manufacturer.

Highlights

  • Oval design fits tight engine bays
  • 3-5/8 in height matches OEM specs
  • Width range 3-25/32 to 4-13/32 in covers multiple applications
  • Baldwin Filters brand trusted by mechanics
  • Element-only construction simplifies replacement

Specifications

BrandBALDWIN FILTERS

Questions about this item

How long does the PA3957 filter last before it needs replacing?

The filter should be changed at the interval specified by the engine manufacturer, which is typically based on hours of operation or mileage driven.

Does the filter housing get hot enough to burn during extended engine runs?

The housing follows normal engine-compartment temperatures; it does not generate heat itself but will be warm to the touch after sustained operation.

What clamp or adapter is required to install this oval air filter?

A clamp sized for the 3-25/32 to 4-13/32 inch outside diameter range is needed to secure the filter to the intake tube.

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