Hydronix String Wound 4.5" x 20" 30 Micron Filter Bosch 25x29x4 MERV 13 filters are

25x29x4 MERV 13 filters are pleated

20x20x2 MERV 11 filters are right on the cusp of being classified as “medium efficiency MERV pleated air filters” and “high-efficiency MERV pleated air filters

Actual Size of Filter:17

And features a special antimicrobial agent for producing clean

25x29x4 MERV 11 filters are right on the cusp of being classified as “medium efficiency MERV pleated air filters” and “high-efficiency MERV pleated air filters

Hydronix String Wound 4.5" x 20" 30 Micron Filter Bosch 25x29x4 MERV 13 filters areHydronix SWC 45 2030 30 Micron Polypropylene String Wound Sediment Filter 4. 5 x 20 Polypropylene string wound sediment filter provides optimum particulate, sediment, and solids filtering capacity. Low Cost Alternative to name brand filters. Fits any standard 4. 5 x 20 filter housing, including Big Blue housings. Large void volume design for low cost, reliable filtration performance with high contaminant holding capacity. Specifications: Polypropylene