Koch Filter P421825 Pleated Air Filter 18x25x2

Product Description

The KOCH FILTER P421825 is a pleated air filter designed for residential and light commercial HVAC systems requiring standard 2-inch depth filtration. Measuring 18 inches by 25 inches by 2 inches, it uses a pleated media construction to increase surface area, which supports effective dust and particulate capture while maintaining adequate airflow through the system. This filter is installed by HVAC technicians and experienced service professionals performing routine filter replacement on forced-air heating and cooling equipment.

The P421825 is suited for standard forced-air HVAC applications where a 2-inch pleated filter is specified. Typical install scenarios include residential gas furnaces, air handlers, and central cooling systems equipped with a filter rack or media cabinet sized for an 18-inch by 25-inch by 2-inch filter. It provides a straightforward drop-in replacement during scheduled preventive maintenance visits.

Key Features

• Pleated media design increases filter surface area for improved particulate capture
• Standard 2-inch depth fits common residential and light commercial filter housings
• 18 x 25 x 2 inch nominal size for broad compatibility with standard filter racks
• Supports airflow balance in forced-air heating and cooling systems

Compatibility

Designed as an OEM-style replacement pleated air filter for residential and light commercial forced-air HVAC systems requiring an 18-inch by 25-inch by 2-inch filter.

Installation Notes

Filter replacement is performed by licensed HVAC technicians or qualified service personnel. Always shut down the air handler or furnace at the system disconnect or thermostat before removing the existing filter. Note the airflow direction arrow printed on the filter frame and ensure the replacement is installed with the arrow pointing toward the blower. Dispose of the used filter in accordance with local waste regulations.

Technical Specifications

• Filter Length: 25 inches
• Filter Width: 18 inches
• Filter Depth: 2 inches
• Filter Type: Pleated

Standard Information

• Brand: KOCH FILTER
• Manufacturer Part Number: P421825