The Flanders E-Z Flow Heavy Duty Air Filter by Flanders Corporation is designed to provide reliable protection for furnaces and central air conditioners. Featuring a continuous filament spun glass filtering medium, this standard grade air filter helps capture dust and airborne particles to support cleaner indoor air. The sturdy frame is constructed from a single piece of chipboard to prevent corner separation, while a tough metal media retainer is attached on both the upstream and downstream sides for added durability and filter strength. With a MERV 4 rating, these filters are ideal for maintaining peak equipment performance and energy efficiency. For best results, replace the air filter monthly during periods of high use. This convenient multipack includes 12 filters, making it easy to keep your HVAC system running smoothly throughout the year. The Flanders E-Z Flow Heavy Duty Air Filter is a trusted choice for homeowners seeking dependable furnace and air conditioner protection. Each filter weighs 3.35 lb. and is manufactured by Flanders Corporation, ensuring consistent quality and performance.