Amazon GrowBright  
04-12-2018 07:31 am
GrowBright 4-Inch CleanFlow HEPA Filter
High-efficiency particulate arrestance (HEPA) filter for 4" round duct/flange air intakes
Blocks 99.97% of particles .3 micrometers or greater in size including dust, pollen, mold spores, and insects while providing excellent airflow
Features easy-install rubberized collar with steel clamp for a proper seal
Recommended for use with high-velocity inline fans / blowers - may create too much restriction for small duct fan types
Measures (max): 7.25" long x 6.125" diameter, 4" female flange
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