An ambient air purification device has a filter device arranged in a filter receiving region of its housing. The filter device has a main filter element and a prefilter element, each having a circumferential frame device. A clamping force generating device is provided in the housing to exert an axial clamping force on the frame device of the main filter element resting, when mounted, at the frame device of the prefilter element. The clamping force is transmitted to the frame device of the prefilter element and presses the latter seal-tightly via a seal against a circumferential contact shoulder of the filter receiving region to seal the filter device in the filter receiving region. The frame device of the main filter element is sealed indirectly by the frame device of the prefilter element in relation to the housing and has no seal location of its own in relation to the housing.

A panel filter is provided. The panel filter can have extended life or higher dust holding capacity by one or more of the following provisions of (a) placing the dimpled pattern (compressed region) on the downstream side and outlet face of the media, (b) using the dimpled media in combination with adhesive spacers and embossments, (c) selection of a media that is depth loading rather than surface loading, (d) operating the pleater/embossing assembly in a manner so as to maintain integrity of the dimples and/or other features as described herein.

A microgravity urine collection apparatus may include a bellows defining an internal chamber having a selectively adjustable volume. The bellows may include an inlet and an outlet. The microgravity urine collection apparatus may further include a first valve coupled to the bellows and configured to selectively control fluid flow through the inlet. The microgravity urine collection apparatus may also include a second valve coupled to the bellows and configured to allow fluid flow out of the bellows via the outlet and prevent fluid flow into the bellows via the outlet.

A filter assembly adaptable to various air moving systems, including HVAC units and portable fans, comprises a lower frame with a flexible mesh that, along with the frame's perimeter, encloses a volume containing particulate filter media. This media filters air while producing an audible noise indicating system operation. The upper frame, attachable to the lower frame, includes a mesh bottom and houses scenting materials to enhance air quality with fragrances, designed to prevent these materials from escaping during use. Both frames feature mechanical fasteners for easy mutual attachment and maintenance. The upper frame's mesh side is partially removable for management of scenting materials. This filter assembly offers both functional air filtration and optional air scenting, providing a versatile and user-friendly solution for improving indoor air environments.

A filter assembly adaptable to various air moving systems, including HVAC units and portable fans, comprises a lower frame with a flexible mesh that, along with the frame's perimeter, encloses a volume containing particulate filter media. This media filters air while producing an audible noise indicating system operation. The upper frame, attachable to the lower frame, includes a mesh bottom and houses scenting materials to enhance air quality with fragrances, designed to prevent these materials from escaping during use. Both frames feature mechanical fasteners for easy mutual attachment and maintenance. The upper frame's mesh side is partially removable for management of scenting materials. This filter assembly offers both functional air filtration and optional air scenting, providing a versatile and user-friendly solution for improving indoor air environments.