Koch C55A921-503 Replacement Cartridge Filter

Koch C55A921-503 Replacement 9.2 OD x 22.3 Length Cartridge Filter

Replace your worn cartridge with a quality-fit option built to match the original form and function. This cartridge filter helps maintain airflow, protect equipment, and keep dust collection performance consistent between service intervals.

Key Filter specifications

• Outside Diameter: 9.2 Inch OD
• Inside Diameter: 5.84 Inch ID
• Length: 22.3 Inch Length
• Endcap configuration: OCLWN Open Closed With Wing Nut
• Gasket: 2 Gaskets, 1 Gasket Under Flange, Other Gasket on Open End — ¼” x ½” x 9.25" ID Gasket under Flange, ½” x ½” x 70.50" ID Gasket on Open end
• Filter Media: 80/20 Cellulose/Polyester Blended Media Fire Retardant
• Shape: Round

Compatibility models: Designed as a replacement Koch C55A921-503 cartridge filter used in industrial dust collection and welding fume extraction applications. This cartridge features a 9.2 Inch OD, 22.3 Inch Length, and OCLWN Open Closed With Wing Nut endcap configuration. Compatible with select Aercology WeldAir 800P, Small Downflo (SDF), Downflo SDF, Easy-Trunk, providing reliable filtration performance for manufacturing, metalworking, and industrial air filtration systems. Cross-reference compatibility should always be confirmed by comparing dimensions, endcap style, gasket configuration, and mounting hardware requirements before ordering.

Popular search phrases for this media/grade include: 80/20 FR blended media, fire retardant dust collector cartridge, welding & cutting dust filtration, reverse pulse fire retardant cartridge.

Industrial Dust Collection Applications

Welding, flame cutting, plasma cutting, laser cutting, metal spraying, ferrous metal grinding, spark-prone reverse pulse jet dust collection

Advantages

Fire-retardant protection, high efficiency filtration, economical replacement, dependable performance, High efficiency with dependable dust release

Fitment note

Collector designs vary by manufacturer and revision. For best results, confirm OD/ID/length, endcap configuration, gasket style, and any bolt pattern or mounting plate requirements.