10 Micron Polypropylene String Wound Sediment Filter - 4.5 x 20 Hanna Instruments while a stability indicator is

while a stability indicator is displayed to alert you when a stable reading has been obtained

Maximum Dimensions: 4 5/8" x 20" (118 mm x 508 mm)

it is reasonable to specify at least MERV 13 filters to maintain good indoor air quality in common types of spaces

Aprilaire 558 Humidifier

10 Micron Polypropylene String Wound Sediment Filter - 4.5 x 20 Hanna Instruments while a stability indicator isHydronix SWC 45 2010 10 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