Abstract: A vent enclosure includes a mount that has a receiver that includes an enclosed volume. The mount is configured to be positioned proximate a vent aperture. A viscous material is disposed within the enclosed volume. A panel is rotationally coupled to the receiver. The panel is configured to be operable between a blocking position and an outflow position. The panel is configured to be moved to the outflow position in response to a flow of process air moving through the vent aperture. The panel returns to the blocking position under a force of gravity. The vent enclosure further includes a hinge that is attached to the panel and the receiver. The hinge engages the viscous material, and rotation of the panel and the hinge rotationally operates the hinge relative to the viscous material. The viscous material slows the rotational operation of the hinge.

Abstract: A vent enclosure includes a mount that has a receiver that includes an enclosed volume. The mount is configured to be positioned proximate a vent aperture. A viscous material is disposed within the enclosed volume. A panel is rotationally coupled to the receiver. The panel is configured to be operable between a blocking position and an outflow position. The panel is configured to be moved to the outflow position in response to a flow of process air moving through the vent aperture. The panel returns to the blocking position under a force of gravity. The vent enclosure further includes a hinge that is attached to the panel and the receiver. The hinge engages the viscous material, and rotation of the panel and the hinge rotationally operates the hinge relative to the viscous material. The viscous material slows the rotational operation of the hinge.

Abstract: A vent enclosure includes an adapter strap that is configured to extend around a vent member. The adapter strap has a plurality of attachment features. The adapter strap has fastening ends. The vent enclosure further includes a fastener that is attached to the fastening ends to secure the adapter strap in an encircling position, and a hood that is attached to the attachment feature of the adapter strap.