Introduced in the 1970s Bag filters quickly became a crucial pawn in the filter industry. Soon it came into widespread use across the country providing efficient and cost-effective air filtration. Since then, EFS has exceeded the status quo with excellent durability, performance, and value for applications that require medium to high efficiencies. These filters have 100% synthetic filter media with non-shedding fibers that repels moisture, combats chemicals, and thwarts bacterial growth. The extruded aluminum frame gives the filter enhanced stability, and ultrasonically sealed pocket seams rule out any leaks & tears while the internal pocket spacers effectively channel the air providing low pressure drop and low energy costs. The rugged build of the filter’s frame restricts bending or collapsing in the most turbulent and hostile environments. Available in MERV 11 - 14 as per ASHRAE 52.2.