Abstract: An air filtration system includes a support structure, an enclosure coupled to the support structure and including an air outlet, a filter and a fan operatively coupled to the enclosure, and a diffusion screen configured to cover the air outlet. The diffusion screen includes a screen frame configured to be removably attachable to the enclosure with at least one releasable fastener, and at least a diffusion layer substantially spanning the screen frame to cover the air outlet to provide unidirectional or laminar air flow from the air outlet.

Abstract: An air filtration system includes a support structure, an enclosure coupled to the support structure and including an air outlet, a filter and a fan operatively coupled to the enclosure, and a diffusion screen configured to cover the air outlet. The diffusion screen includes a screen frame configured to be removably attachable to the enclosure with at least one releasable fastener, and at least a diffusion layer substantially spanning the screen frame to cover the air outlet to provide unidirectional or laminar air flow from the air outlet.

Abstract: An air filter including a filter media having a plurality of flat pleats defining a plurality of truncated pleat tips and sloping side surfaces along a front face and a rear face. The truncated pleat tips are oriented perpendicular to the direction of pleating and are configured with a planar tip portion. The reinforcement structure includes at least one generally planar first reinforcing strip oriented in the direction of the pleating and connected to the truncated pleat tips along the rear face. The reinforcing structure further includes at least one generally planar second reinforcing strip oriented in the direction of pleating and connected to the truncate pleat tips along the front face.

Abstract: A filter frame including a panel having a plurality of V-shaped elements disposed on the first side thereof. Each V-shaped element includes a pair of slots each configured to receive and orient a filter element. A portion of the panel disposed between adjacent pairs of V-shaped elements has an opening form therein to define a handle for carrying the filter frame.

Abstract: A volatile liquid storage and emissions control apparatus and method comprising an above-ground volatile liquid storage tank having a bottom, a vertical circular wall and an external fixed roof, the tank having an internal floating roof, and air vents in the tank wall; an emissions collection apparatus comprising a conduit having an emissions laden air inlet end communicating with the tank vapor space and an emissions laden air outlet end communicating with the inlet end of an emissions abatement apparatus, with the conduit including a pump for withdrawing emissions laden air from the tank vapor space and feeding it into the emissions abatement apparatus, and the emission abatement apparatus being capable of eliminating most of the emissions from the emissions laden air with formation of a gaseous effluent which is discharged to the atmosphere.