The present invention relates to a toxic gas purification apparatus having a local exhaust function. Here, the purification device is a device for collecting and purifying toxic or harmful gases in places such as a laboratory or a workplace that are easily exposed to various chemical substances. In addition, the purification device includes a local exhaust means for intensively inhaling harmful gas generated at a specific point of interest by the user. Accordingly, the purification device includes an additional function capable of intensively collecting and purifying harmful gases at specific points in addition to the original function of collecting and purifying harmful gases in a wide area.

A damper for a heating, ventilation, and air conditioning (HVAC) system includes a damper blade, a frame coupled to the damper blade and defining a perimeter of an air flow path through the damper, and a frame member of the frame. The frame member defines a portion of the perimeter of the air flow path and includes a base portion, an upstream end portion, and a downstream end portion. Each of the upstream end portion and the downstream end portion extends obliquely from the base portion.

A pressure relief assembly includes a pressure relief device including a housing that defines at least one air passage chamber, and at least one flap secured within the air passage chamber(s). The pressure relief device is configured to securely couple to a component. A cover is secured to the pressure relief device. At least one impact-absorbing bumper is disposed between the pressure relief device and the cover. The impact-absorbing bumper(s) is configured to dampen impact energy and undesirable noise.

A ceiling inlet unit that assists in bringing air into the interior room of a building. The unit has a housing providing an opening to the attic of the building, the housing having movable blades with brush borders on the ends, pivotally mounted with a continuous hinge in the housing with seals to minimize air leakage when the blades are closed. The housing is designed in such a way to provide optimal air mixing situations through available cross-sectional area at different ventilation stages. The blades are designed to maximize air jet throw during lower ventilation stages, and provide superior total airflow during maximum ventilation stages.

An airfoil blade assembly includes an upper airfoil shell, and a lower airfoil shell and a pair of upper legs protruding from the upper airfoil shell and extending towards the lower airfoil shell. A pair of lower legs protrudes from the lower airfoil shell and extending towards the upper airfoil shell and are formed by bending material of the lower airfoil shell back upon itself. An upper strengthening rib formed is in the upper airfoil shell, and a lower strengthening rib is formed in the lower airfoil shell. The pair of upper legs and the pair of lower legs are abutting when the upper airfoil shell and the lower airfoil shell are selectively fixed to one another.

A method for producing an air duct damper includes the steps of punching from sheet metal stock a damper preform having a body and two diametrically opposed arms extending from opposite sides of the body; and forming an indentation in the damper preform extending between and up to respective ends of the two arms.

The present disclosure provides a damper used in heating, ventilation, and air conditioning (HVAC) systems. In an aspect, the damper may include a frame composed of at least two attached frame webs, each frame web comprising a C-shaped component. The damper may further include a damper blade removably attached to each compartment formed by the frame webs.

An air conditioner has a casing and a wind direction changing device. The casing has an air inlet, an air outlet, an outer air path wall, and an inner air path wall. The wind direction changing device has an up-down rotation shaft and a deflector. The deflector extends from the up-down rotation shaft toward the outer air path wall. The deflector has an outer air path wall-side end which faces the outer air path wall and has a first arc shape.

An airfoil blade assembly includes an upper airfoil shell, and a lower airfoil shell and a pair of upper legs protruding from the upper airfoil shell and extending towards the lower airfoil shell. A pair of lower legs protrudes from the lower airfoil shell and extending towards the upper airfoil shell and are formed by bending material of the lower airfoil shell back upon itself. An upper strengthening rib formed is in the upper airfoil shell, and a lower strengthening rib is formed in the lower airfoil shell. The pair of upper legs and the pair of lower legs are abutting when the upper airfoil shell and the lower airfoil shell are selectively fixed to one another.

An air extractor for a vehicle, the air extractor comprising a frame having a top portion, a bottom portion, a left side portion and a right side portion surrounding a central air passage, the frame having an inlet side for receiving air from a passenger compartment of the vehicle and having an outlet side for exhausting the air from the passenger compartment of the vehicle, a gasket to seal the frame to the vehicle, a plurality of spoilers supported by the frame and disposed within the central air passage and a plurality of flaps pivotally mounted on the outlet side to pivot between a closed position that inhibits airflow and an open position that permits airflow, wherein each of the flaps comprises a plurality of bumpers to attenuate slap noise of the flaps and wherein each of the flaps further comprises a skirt to minimize air leakage.