Air Filter 18'' x 20'' x 1'' 4-MERV Fiberglass, AAF Flanders 10055011820 (12-PK) BRAND NEW! THE BOX WAS OPENED AND INSPECTED. The AAF Flanders 10055011820 EZ Flow II air filter is a 18x20x1 inch disposable fiberglass filter designed for low-restriction airflow and reliable particulate capture in residential and light commercial HVAC systems. With a MERV 4 rating, it effectively traps medium-sized airborne particles such as household dust, lint, pollen, mold spores, and debris, helping to maintain clean equipment and support efficient system operation. It is ideal for environments where basic filtration is sufficient and minimal airflow resistance is desired. Constructed with continuous filament spun-glass fiberglass media bonded with a resinous agent, this filter resists compression and maintains structural integrity under airflow pressure. The non-pleated, non-electrostatic design ensures low static pressure drop, promoting energy-efficient performance. A full-perimeter hot-melt adhesive seals the media directly to a one-piece heavy chipboard frame, eliminating corner separation and preventing air bypass?making the filter self-retaining without the need for a metal retainer. The EZ Flow II is UL Class II rated for flame and smoke safety, meeting industry standards for use in air handling systems. It is trimmable, allowing for minor adjustments to fit non-standard filter housings. Weighing 0.367 lbs, it is lightweight and easy to install in standard 18x20x1 furnace or air handler compartments. Recommended for monthly replacement, this filter helps reduce dust buildup on coils, blowers, and ductwork. While it does not capture viruses or ultrafine particles, it provides dependable performance for general-purpose heating and cooling protection. Features - Nominal size: 18x20x1 inches for standard HVAC compatibility - Actual size: 17-7/8 x 19-7/8 x 3/4 inch for secure fit - MERV 4 rating for improved basic filtration over MERV 2 - Fiberglass media with low airflow resistance and high dust-holding capacity - Captures dust, lint, pollen, mold spores, and household debris - One-piece chipboard frame with hot-melt seal prevents air bypass - Self-retaining design requires no metal retainer - Trimmable for minor size adjustments - UL Class II rated for fire and smoke safety - Ideal for residential furnaces and air conditioning systems Specifications - Brand Name: AAF Flanders - Model Name: AAF Flanders 10055011820 - Part Number: 10055011820 - UPC: 031949150365 - Alternative UPC: 037947196275 - Product Type: Air Filter - Air Filter Type: Fiberglass - Filter Class: Class II - MERV Rating: 4 MERV - Nominal Filter Size (HxWxD): 18x20x1 - Air Filter Size: 18x20x1 - Actual Size: 17-7/8 x 19-7/8 x 3/4 inch - Length: 18 inches - Width: 20 inches - Depth: 1 inch - Height: 20 inches - Pleated: No - Electrostatic: No - Metal Mesh Support: No - Filter Frame Material: Chipboard - Media Material: Fiberglass - Filters Dust/Lint: Yes - Filters Pollen: Yes - Filters Mold Spores: Yes - Filters Bacteria: Yes - Filters Smoke: Yes - Filters Viruses: No - Trimmable: Yes - Number of Items: 1 - Item Weight: 0.367 lbs - Packaging Type: 1 pk - Suggested Users: Unisex-Adult - Manufacturer: AAF Flanders - Country of Origin: United States Product Application The AAF Flanders 10055011820 EZ Flow II MERV 4 fiberglass air filter is engineered for use in standard residential and light commercial HVAC systems requiring a reliable, low-cost primary filter. Its efficient design helps keep equipment clean, improves airflow, and extends system life. Recommended for monthly replacement, it is best suited for homes without severe air quality concerns, providing consistent performance in furnaces, air handlers, and return air grilles. With its trimmable feature and durable construction, it offers flexibility and durability for everyday heating and cooling protection.