A method of assembling a personal air purifying respirator includes assembling a housing including a blower disposed therein, a filter cavity, and an outlet manifold; installing a filter on the housing; attaching a filter cover to the housing with the filter cover disposed over the filter, wherein the filter cover defines an air inlet; and testing the filter including energizing the blower, introducing a testing aerosol into the air inlet, and measuring air exiting the outlet manifold.

A ducted breathing apparatus and methods for assembling and using such ducted breathing apparatus are provided. The ducted breathing apparatus may include a face cover for sealing at least a portion of a user's face. The ducted breathing apparatus may include a ducted air channel element for providing direct air flow from a user's mouth within the mask to the outside environment. The ducted breathing apparatus may include a coupling element for providing a sealed mating connection between the ducted air channel element and the face cover.

A ducted breathing apparatus and methods for assembling and using such ducted breathing apparatus are provided. The ducted breathing apparatus may include a face cover for sealing at least a portion of a user's face. The ducted breathing apparatus may include a ducted air channel element for providing direct air flow from a user's mouth within the mask to the outside environment. The ducted breathing apparatus may include a coupling element for providing a sealed mating connection between the ducted air channel element and the face cover.

Proposed is a multi-layer filtration system including a metal catalyst filter unit, a carbon filter unit, and an inorganic compound filter unit. The metal catalyst filter unit includes at least one among metals including Ni, Co, Fe, Cu, Cr, Mg, Zn, Ba, Au, Ag, Pd, Pt, Ru, Mn, and Ti, oxides thereof, and mixtures thereof. The carbon filter unit includes at least one of activated carbon or activated carbon fiber. The inorganic compound filter unit includes an inorganic compound capable of adsorbing toxic gas. The multi-layer filtration system has good removal effect for toxic gas. A filter module including the multi-layer filtration system and a gas mask including the multi-layer filtration system are also proposed.

Proposed is a multi-layer filtration system including a metal catalyst filter unit, a carbon filter unit, and an inorganic compound filter unit. The metal catalyst filter unit includes at least one among metals including Ni, Co, Fe, Cu, Cr, Mg, Zn, Ba, Au, Ag, Pd, Pt, Ru, Mn, and Ti, oxides thereof, and mixtures thereof. The carbon filter unit includes at least one of activated carbon or activated carbon fiber. The inorganic compound filter unit includes an inorganic compound capable of adsorbing toxic gas. The multi-layer filtration system has good removal effect for toxic gas. A filter module including the multi-layer filtration system and a gas mask including the multi-layer filtration system are also proposed.

Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell that conforms to a user's face, and a securing portion connected to the shell that may operate to secure a filter to the user's face with the filter covering the user's nose and mouth. A securing force may be applied to the filter via the first material portion in a direction toward the user's face, thereby sealing the filter around the user's nose and mouth. Various implementations involve elastic and other material that facilitate sealing of the filter around the user's nose and mouth.

Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell that conforms to a user's face, and a securing portion connected to the shell that may operate to secure a filter to the user's face with the filter covering the user's nose and mouth. A securing force may be applied to the filter via the first material portion in a direction toward the user's face, thereby sealing the filter around the user's nose and mouth. Various implementations involve elastic and other material that facilitate sealing of the filter around the user's nose and mouth.

An odor containment and elimination device includes a containment center, first pathway, second pathway, and third pathway. The containment center can be configured to receive an odorous item that emits a contaminated air including an odor. The first pathway can be in fluid communication with the containment center and an outside environment and configured to allow contaminated air to travel from the containment center to a first release point while inhibiting seeping of the contaminated air from the first pathway into the outside environment prior to the first release point. The second pathway can be in fluid communication with the containment center and the outside environment via a first intake. The third pathway can be in fluid communication with the containment center and the outside environment and configured to reduce contaminated air released into the environment and/or direct the contaminated air through a door or window.

An odor containment and elimination device includes a containment center, first pathway, second pathway, and third pathway. The containment center can be configured to receive an odorous item that emits a contaminated air including an odor. The first pathway can be in fluid communication with the containment center and an outside environment and configured to allow contaminated air to travel from the containment center to a first release point while inhibiting seeping of the contaminated air from the first pathway into the outside environment prior to the first release point. The second pathway can be in fluid communication with the containment center and the outside environment via a first intake. The third pathway can be in fluid communication with the containment center and the outside environment and configured to reduce contaminated air released into the environment and/or direct the contaminated air through a door or window.

Described are oxygen control systems that utilize compressed air or oxygen. The oxygen control systems may include a control device having a first inlet that enables the flow of a supply gas from a high pressure gas source at an input pressure into the control device. The control device also includes a second inlet that enables a flow of atmospheric air into the control device and an outlet in fluid communication with the first inlet and the second inlet. The control device also includes a pressure regulator that is operable in a first mode and a second mode. In the first mode, the pressure regulator reduces input pressure of the gas to a first outlet pressure at the outlet, and, in the second mode, the pressure regulator reduces the input pressure of the gas to a second outlet pressure at the outlet that is greater than the first outlet pressure.