A silencing accessory or specially designed muffler to be attached to the exhaust of a portable generator, which is specially designed to reduce or eradicate excessive noise, as well as filter emissions. The present invention comprises a replaceable filter to provide a product that solves the problems of noise and air pollution created by these necessary units

A filter system has a filter housing enclosing an interior space. An exchangeable filter element and a resonator structure are arranged in the interior space. The resonator structure has resonator housing elements forming a closed resonator housing enclosing a cavity in an intended state. A partition divides the cavity into a first and a second chamber. The partition has a passage through which the first and second chambers are acoustically coupled. The filter housing has a housing part providing one of the resonator housing elements. The filter element is provided with another one of the resonator housing elements. The filter element has a filter bellows and a cutout penetrating the filter bellows from an inflow side to an outflow side of the filter bellows. The cutout is a resonator housing receptacle. At least one of the resonator housing elements is arranged in the cutout.

A filter element has a holder arrangement with a filter bellows and a partition element arranged at different regions of the holder arrangement. The partition element extends between first and second chambers of a resonator structure when installed in a filter system and has a passage acoustically coupling the two chambers. Such a filter element is exchangeably arranged in the filter housing of the filter system which has a main inlet, a main outlet, and an auxiliary connection outlet. The filter bellows is arranged in flow direction between the main inlet and the two outlets. The partition element is arranged between the two chambers of the resonator structure for noise damping of the auxiliary connection outlet. Its passage acoustically couples the two chambers. The partition element projects into an auxiliary connection resonator region of the filter housing and has end regions contacting walls delimiting the auxiliary connection resonator region.

An exhaust gas treating device includes a honeycomb structure including an inner honeycomb structure body including a honeycomb substrate having porous inner partition walls and a circumferential wall disposed at a circumference of the honeycomb substrate, an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face, and plugging portions; and a can member storing the honeycomb structure. The can member includes an inflow tube and a barrel portion which is continuous with the inflow tube, and in the barrel portion an outlet is formed, the honeycomb structure is stored in the can member in a state of having a clearance between a second end face and the can member and having a clearance between the outer outflow end face and the can member.

An air cleaner of an internal combustion engine is provided with a first housing including an inlet, a second housing including an outlet, and a filter element located between the first housing and the second housing. A Helmholtz resonator is arranged inside the first housing. An upright wall projects from a bottom wall of the first housing toward the filter element and extends in an axial direction of the inlet. The upright wall forms a chamber of the Helmholtz resonator. A noise-absorption region is defined by the upright wall, a side wall of the first housing, the bottom wall, and the filter element. The noise-absorption region leads to the inlet and extends in the axial direction.

An air guide housing, in particular for a ventilation, heating or air conditioning system of a vehicle, with at least one first air inlet opening, wherein the at least one first air inlet opening has a cross sectional area which is arranged substantially vertical to a first axis, and with at least one second air inlet opening, wherein the at least one second air inlet opening has a cross sectional area which is arranged substantially vertical to a second axis, and having at least one air outlet opening, wherein the at least one air outlet opening has a cross sectional area which is arranged essentially vertical to a third axis, and with a fan impeller for suctioning air into the air guide housing. The second axis and the third axis are arranged substantially parallel to one another.

A tabletop cooking assembly for preparing foods thereon comprises a cooking element having a cooking area and a vent disposed peripherally to one side of the cooking element defining an aperture for receiving smoke from the cooking element. The assembly includes a first exhaust duct, a filter assembly, an electrostatic precipitator, and a high velocity blower. The first exhaust duct is substantially unobstructed and in fluid communication with the vent for directing smoke away from the cooking element. The high velocity blower is in fluid communication with the first exhaust duct and the filter assembly for drawing smoke from the cooking element through the vent. The heating system includes a retaining plate, a plurality of heating strips, and an insulating material. The heating strips are disposed between the retaining plate and the heating surface to heat the cooking area for preparing foods thereon.

The present invention relates to a vacuum pump (1) comprising a casing (2) in which are disposed a first inlet orifice (21) and a second outlet orifice (22) to allow the flowing of a flow of air (F), and in the interior of which a filtering element (3) is mounted in a removable way, wherein at least one orifice of the said casing (2) selected from among the said first inlet orifice (21) and the said second outlet orifice (22) is disposed on an exhaust lid (4) which is at the same time removable from the said casing (2) but integral with the said filtering element (3) and wherein the connection between the casing (2) and the exhaust lid (4) is not tight. The present invention also relates to a cartridge (30) for the corresponding vacuum pump (1) wherein an exhaust lid (4) is integrated in the said closure nozzle (32) of the filtering element (3), the connection between the casing (2) and the exhaust lid (4) not being tight.

The current invention are air filtration devices for outdoor use. The filtration systems would be installed on residential, commercial, and industrial buildings. They would be placed on a large amount of buildings to improve air quality over a large area. As the devices will be installed on regularly used buildings, they have a double casing that dampens noise. The filters will remove fine particulates and many problematic air pollutants. The entire system is powered by a low consumption battery.

A filter for an oil catch apparatus is provided. The oil catch apparatus is capable of efficiently extracting oil from air flowing through the oil catch apparatus while being of compact size. The filter includes a cylindrically wound main filter unit, a first keep member for keeping one end of the main filter unit, and a second keep member for keeping the other end of the main filter unit. Air flowing into the main filter unit from an opening formed in the first keep member is cleared of impurities upon passing through the main filter unit, and exits out of the main filter unit.