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Vent Net Cover or Duct Mesh Barriers are to use to block dirt or duct from entering your house or indoor garden grow room. Use it on your vent fans, air ducting or flanges of your grow light reflector hoods for either intake or exhaust purposes. These vent covers are in the sizes of 4 inch, 6 inch, 8 inch, 10 inch, and 12 inch featuring washable materials and its easy to use elasticized opening to seal off a perfect fit onto standard sizes of all kinds of flanges. HOW TO USE: Attach Back-Glued Male Velcro Tabs onto the Flange approximately as Female Velcros sewn on Vent Cover. Then, put Vent Cover onto it.