Nu-calgon 4940-57 Permafilter Flex Electrostatic Air Filter 16 Inches X 25 Inches X 1 Inches

Product Description

The NU-CALGON 4940-57 PermaFilter Flex is a permanent electrostatic HVAC air filter sized 16 inches x 25 inches x 1 inches. It is designed for residential and commercial HVAC systems that require reliable, long-term air filtration without the ongoing cost of disposable filters. HVAC technicians and facility maintenance professionals rely on this filter to improve indoor air quality and maintain system efficiency across a wide range of applications. The filter works by generating an electrostatic charge as air passes through a layered maze of static-prone synthetic fibers. This charge attracts and holds airborne particles until the filter is washed and reused. There is no external power source needed. The electrostatic process is a naturally occurring phenomenon that requires no electricity to operate and produces no harmful ozone or emissions. The NU-CALGON 4940-57 is rated MERV 8 by ASHRAE standards, making it effective at capturing a broad range of airborne contaminants. These include dust, pollen, pet dander, lint, mold spores, soot, and other fine particulates that degrade air quality and reduce HVAC system performance. The synthetic, anti-microbial material resists microbial growth on the filter surface, adding another layer of protection for occupied spaces. Unlike standard disposable filters, the PermaFilter Flex never needs to be replaced. It can be removed, washed according to the included cleaning instructions, and reinstalled. This makes it a cost-effective, environmentally responsible choice for long-term HVAC maintenance programs. With over 60 sizes and multiple thickness options available in the PermaFilter line, this filter is built to fit a wide variety of air handler and furnace applications. The flex design accommodates installations where a rigid filter frame may not seat perfectly. It carries a lifetime warranty, providing lasting value for trade professionals and end users alike.

• Permanent electrostatic filter rated MERV 8 per ASHRAE standards for effective particulate removal
• Captures dust, pollen, pet dander, mold spores, lint, soot, and other airborne pollutants
• Washable and reusable design with lifetime warranty and no replacement needed

Product Highlights

The NU-CALGON 4940-57 PermaFilter Flex delivers MERV 8 filtration in a washable, permanent electrostatic design sized 16 inches x 25 inches x 1 inches. It eliminates the recurring cost of disposable filters while maintaining strong air quality performance in residential and commercial HVAC systems.

Product Information

Standard Information

• Brand: NU-CALGON
• Manufacturer Part Number: 4940-57

Technical Specifications

• Product Type: HVAC Filter
• Filter Type: Electrostatic Permanent
• Material: Synthetic
• Size: 16 inches x 25 inches x 1 inches
• MERV Rating: 8
• Warranty: Lifetime