Koch Filter P421818 Pleated Air Filter 18x18x2 in

Product Description

The KOCH FILTER P421818 is a pleated air filter built for HVAC systems that require a square-format filter with added depth. At 18 inches by 18 inches with a 2-inch depth, this filter offers greater dust holding capacity than standard 1-inch filters, extending service intervals and reducing maintenance frequency. The pleated media design increases surface area, allowing the filter to capture airborne particulates more effectively while maintaining adequate airflow through the system. It is installed by HVAC technicians and knowledgeable service professionals as part of routine preventive maintenance.

This filter is suited for residential and light commercial HVAC applications where an 18x18x2-inch filter slot is specified. The 2-inch depth makes it a practical choice for air handlers, furnaces, and fan coil units designed to accept extended-depth filtration. Systems with higher dust loads or longer service intervals between filter changes benefit from the increased media volume this filter provides.

Key Features

• Pleated media construction increases surface area for improved particulate capture
• 2-inch depth delivers greater dust holding capacity compared to standard 1-inch filters
• Square 18x18-inch format fits a wide range of residential and light commercial HVAC equipment
• Extended service life reduces the frequency of filter change intervals
• Designed as a direct drop-in replacement for standard 18x18x2-inch filter applications

Compatibility

Designed as an OEM-style replacement filter for residential and light commercial HVAC systems requiring an 18x18x2-inch pleated air filter.

Installation Notes

Filter installation should be performed by a licensed HVAC technician or qualified service professional. Always shut down the air handler or furnace at the disconnect or thermostat before replacing the filter. Confirm airflow direction arrows on the filter frame align with the direction of airflow through the system before seating the filter. Inspect the filter housing for gaps or bypass paths that could allow unfiltered air to pass around the media.

Technical Specifications

• Filter Dimensions: 18 x 18 x 2 inches
• Filter Type: Pleated

Standard Information

• Brand: KOCH FILTER
• Manufacturer Part Number: P421818