Koch Filter P441824 Pleated Air Filter 18x24x4

Product Description

The KOCH FILTER P441824 is a pleated air filter built for HVAC systems that require large-format, deep-media filtration. The 4-inch depth provides greater media surface area compared to standard 1-inch and 2-inch filters, supporting enhanced particulate capture and extended service intervals. The 18 x 24 x 4 inch nominal size fits air handlers, rooftop units, and forced-air furnaces where deeper filter housings are specified. Licensed HVAC technicians and mechanical contractors install this type of filter in both residential and light commercial applications.

This filter is suited for systems with 4-inch filter tracks or dedicated deep-media filter housings. The larger depth is commonly found in high-efficiency residential air handlers, commercial split systems, and dedicated filtration cabinets installed in-line with return-air ductwork. Deep-media pleated filters at this size are a standard upgrade path when longer change intervals are a service priority or when increased particle-holding capacity is required for the application.

Key Features

• 4-inch depth increases media surface area for improved particle capture capacity
• Pleated media construction supports efficient airflow while maintaining filtration performance
• Large-format 18 x 24 x 4 inch size fits commercial and residential deep-media housings
• Extended service life reduces filter change frequency compared to standard 1-inch filters

Compatibility

Designed as an OEM-style replacement for HVAC systems and air handlers that accept a 4-inch deep pleated filter in an 18 x 24 inch nominal frame size.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified mechanical contractor. Always shut down the air handler or furnace at the disconnect or breaker before accessing the filter compartment. Verify the airflow direction arrow on the filter frame aligns with the direction of air movement toward the blower. Check the filter housing for an airtight seal after installation to prevent bypass around the filter media.

Technical Specifications

• Filter Type: Pleated
• Nominal Length: 24 inches
• Nominal Width: 18 inches
• Nominal Depth: 4 inches

Standard Information

• Brand: KOCH FILTER
• Manufacturer Part Number: P441824