Koch Filter P411321 Pleated Air Filter 13x21x1 in

Product Description

The KOCH FILTER P411321 is a pleated air filter designed for residential and light commercial HVAC systems that require near-standard filter sizing. Measuring 13 inches by 21 inches by 1 inch, this filter uses a pleated media construction to increase surface area, improving dust and particulate capture while maintaining adequate airflow through the system. Licensed HVAC technicians and building maintenance professionals install this filter as part of routine preventive maintenance on forced-air heating and cooling systems.

This filter is suited for forced-air HVAC applications where a 13 x 21 x 1 inch filter slot is specified. It fits systems that use near-standard or custom-dimension filter housings, including those found in residential air handlers and furnaces. The pleated design makes it a practical upgrade path from flat fiberglass panel filters in compatible filter racks and return-air grilles.

Key Features

• Pleated media construction increases surface area for improved particulate capture compared to flat panel filters
• Near-standard 13 x 21 x 1 inch dimensions fit filter housings that require non-standard sizing
• 1 inch depth fits standard single-slot filter tracks and return-air grille frames
• Designed to support airflow performance while capturing dust and airborne debris

Compatibility

Designed as an OEM-style replacement pleated air filter for residential and light commercial forced-air HVAC systems requiring a 13 x 21 x 1 inch filter size.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified maintenance personnel. Always power down the air handler or furnace at the disconnect before removing or installing the filter. Confirm the airflow direction arrow on the filter frame aligns with the direction of airflow in the system before inserting. Replace filters on a regular maintenance schedule to prevent restricted airflow and system strain.

Technical Specifications

• Filter Length: 21 inches
• Filter Width: 13 inches
• Filter Depth: 1 inch
• Filter Type: Pleated

Standard Information

• Brand: KOCH FILTER
• Manufacturer Part Number: P411321