Nu-calgon 494020 Electrostatic Hvac Filter 20x20x1 Merv 8

Product Description

The NU-CALGON 494020 is a permanent electrostatic air filter designed for residential and light commercial HVAC systems. It generates an electrostatic charge as air passes through a matrix of static-prone synthetic fibers, attracting and capturing airborne particulates without relying on disposable media. Rated MERV 8 per ASHRAE standards, it provides effective filtration of dust, pollen, pet dander, and similar particles. Because it is washable and reusable, the filter does not require periodic replacement — only periodic cleaning. Licensed HVAC technicians and building maintenance staff install and service this filter in standard air handler and furnace return-air applications.

The 494020 is sized at 20 inches x 20 inches x 1 inch, fitting standard filter slots in residential forced-air furnaces, air handlers, and compatible return-air grilles of the same nominal dimension. The electrostatic design maintains low air resistance while delivering MERV 8 particulate capture, making it suitable for systems where balancing filtration efficiency with adequate airflow is a priority. It is a direct drop-in solution for any system that accepts a 20 x 20 x 1 inch filter frame.

Key Features

• MERV 8 rated per ASHRAE standards for effective particulate removal
• Electrostatic charge generated passively by airflow through synthetic fiber maze — no power required
• Washable and reusable with a lifetime warranty, eliminating recurring replacement costs
• Synthetic construction resists moisture damage during routine wash cycles
• Low-resistance design supports proper airflow in standard forced-air systems

Compatibility

Designed as a permanent, washable replacement for any standard 20 inches x 20 inches x 1 inch HVAC filter position in residential or light commercial forced-air furnace, air handler, or return-air grille applications.

Installation Notes

Installation is performed by HVAC technicians or qualified maintenance personnel. Power down the air handler or furnace at the disconnect or thermostat before removing the existing filter. Slide the 494020 into the filter track with the airflow arrow oriented in the direction of airflow toward the blower. When cleaning, remove the filter, rinse with water, allow it to dry completely, and reinstall before returning the system to service.

Technical Specifications

• Material: Synthetic
• Product Type: HVAC Filter
• Filter Size: 20 inches x 20 inches x 1 inch
• MERV Rating: 8
• Warranty: Lifetime

Standard Information

• Brand: NU-CALGON
• Manufacturer Part Number: 494020