Pleated Air Filter: 18 x 20 x 1", MERV 4, 20% Efficiency MPN:10055.011820

This 18x20x1 pleated air filter is designed with a Minimum Efficiency Reporting Value (MERV) of 4 rating, offering 20% efficiency in capturing airborne particles such as dust and pollen. The filter can be used to protect HVAC systems from dust accumulation which may cause damage over time and reduce energy consumption by ensuring clean air enters the system thus maintaining optimal efficiency. It's an ideal choice for residential settings with smaller ductwork or commercial environments where regular low levels of particulate matter should be removed from the indoor environment, making it suitable for placement within ventilation systems catering to limited spaces where replacing filters regularly is essential to prevent disruption to system performance.