The Midwest™ Paragon™ Series Vacupac™ Bin Vent can be placed on the roof of a silo or bin to maintain negative pressure during filling. Available up to 3000 CFM, Midwest™ Vacupac™ Bin Vents are designed with low air to cloth ratios and low interstitial velocity, insuring good filter cleaning performance over long periods of time. The threaded "screw-in" filter cartridges are accessible by (2) large hinged cast aluminum doors, making filter inspection quick and easy with no tools required.