An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first urethane portion. The first urethane portion and the second urethane portion are integrated with each other in a state where the second urethane portion is incorporated in the part of the first urethane portion.

A filtration device (FD) having a front plastic sheet (PS), a sponge element (SE), and a filter element (FE) may be secured to a mask (M) with a “stickie” interface (AL, FS; FIGS. 5 and 6), or with a rigid mechanical interface (FIGS. 7 and 8) which may include a rigid support (RS) (FIG. 9). The rigid support (RS) may have a recess for receiving the sponge element (SE) and avoiding it being compressed when the filter element (FE) is disposed between to the outlet side of the rigid support (RS) and the filter element (FE). The sponge element (SE) may be provided with a cutout (CO; FIG. 10) for accommodating the flap of a non-rebreather mask (M). A protective cover (PC; FIG. 11) having perforations (PF) and a second sponge element (SE2) may be provided on the outlet side of the filter element (FE). Methods of use.

A filter for an air conditioner has a body formed of an air-transmissive material. The body is of a generally rectangular configuration and has a top, bottom, a front, a back and a pair of sides. The body has a plurality of cuts formed through a thickness thereof. The plurality of cuts define a plurality of cubical members frangibly connected together. The plurality of cubical members are separable from a remainder of the body such that the body has a size suitable for being received within a filter-receiving receptacle of the air conditioner.

An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first urethane portion. The first urethane portion and the second urethane portion are integrated with each other in a state where the second urethane portion is incorporated in the part of the first urethane portion.

The present invention is a portable air purifier device intended to be attached to the belt or to the neck of a user. Purified air is generated by electrochemically and magnetically treating a polluted air. Polluted air is forced through an ionized water, which absorbs particles and kills possible air born bacteria. A magnetic filter assures that small metal particles are also separated from the polluted air. The purified air is then delivered towards the face of the user either through an air curtain or through a mask.

A filter for an air conditioner has a body formed of an air-transmissive material. The body is of a generally rectangular configuration and has a top, bottom, a front, a back and a pair of sides. The body has a plurality of cuts formed through a thickness thereof. The plurality of cuts define a plurality of cubical or rectangular members frangibly connected together. The plurality of cubical or rectangular members are separable from a remainder of the body such that the body has a size suitable for being received within a filter-receiving receptacle of the air conditioner.