Ultravation 91-012 high-efficiency pleated media air filter, 16 x 20 x 5 in, MERV 11. Designed for compatible whole-home media air cleaners and forced-air HVAC systems, the deep pleat design increases surface area for extended dirt holding while maintaining low airflow restriction. The unit features a reinforced white frame and visible black foam gasket for a secure dust-tight fit. Easy to install with recommended annual inspection for peak performance.