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Round automotive air filter, 11-1/8 by 12-1/2 inches

Baldwin Filters

Baldwin Filters PA1637-FN Automotive Air Filter 11-1/8 x 12-1/2 in

SKU CH-K4V5-G8EXQ

Automotive engine air filter with an 11-1/8 inch outside diameter and 12-1/2 inch height

  • Round automotive air filter design fits engine intake
  • 11-1/8 inch outer diameter matches housing specifications
  • 12-1/2 inch height ensures proper filter seating
  • Baldwin Filters brand built for engine protection
  • Element-only construction simplifies replacement process

Baldwin Filters PA1637-FN automotive air filter

The Baldwin Filters PA1637-FN is a round automotive engine air filter designed to fit specific engine air boxes. It serves vehicle owners and mechanics replacing a worn filter element during routine maintenance.

Dimensions and fit constraints

This filter measures 11-1/8 inches in outside diameter and 12-1/2 inches in height. The fixed round profile means it only fits housings built to those exact dimensions, so verification against the vehicle specification is essential before installation.

Filtration capacity and service life

The element provides the airflow and contaminant capture required by the original engine calibration. It handles normal driving conditions until the recommended service interval, after which restriction rises and a new filter is needed to restore full flow.

Highlights

  • Round automotive air filter design fits engine intake
  • 11-1/8 inch outer diameter matches housing specifications
  • 12-1/2 inch height ensures proper filter seating
  • Baldwin Filters brand built for engine protection
  • Element-only construction simplifies replacement process

Specifications

BrandBALDWIN FILTERS

Questions about this item

Should I choose the 11-1/8 inch or 12-1/2 inch dimension when ordering this Baldwin Filters PA1637-FN air filter?

Both measurements describe the same round filter; the 11-1/8 inch figure is the outside diameter while 12-1/2 inch is the height, so you order the single part number PA1637-FN.

What does the 11-1/8 inch outside diameter mean once the filter is installed in the engine?

It matches the housing opening so air flows through the media without bypass; the 12-1/2 inch height ensures the lid seals correctly.

Which interface or standard governs fitment of this automotive air filter?

Fitment follows the vehicle manufacturer's specifications for the PA1637-FN part number; the filter has no universal interface standard beyond that application.

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