A wafer stocker is capable of further improving an environment around wafers. The wafer stocker includes a housing, a loading device provided on a front surface of the housing, a wafer cassette shelf arranged in the housing, a wafer transfer robot configured to move the wafers from a transfer container mounted on the loading device to a wafer cassette in the wafer cassette shelf, a wafer cassette delivery device configured to move the wafer cassette in the wafer cassette shelf to a stage having a different height, and a fan filter unit configured to generate a laminar flow in a wafer transfer space and in a wafer cassette transfer space.

A wafer stocker is capable of further improving an environment around wafers. The wafer stocker includes a housing, a loading device provided on a front surface of the housing, a wafer cassette shelf arranged in the housing, a wafer transfer robot configured to move the wafers from a transfer container mounted on the loading device to a wafer cassette in the wafer cassette shelf, a wafer cassette delivery device configured to move the wafer cassette in the wafer cassette shelf to a stage having a different height, and a fan filter unit configured to generate a laminar flow in a wafer transfer space and in a wafer cassette transfer space.

An air sterilization system utilizing three stages of sterilization using UVC and microwave energy created by one or more magnetrons powered by solid state high voltage supplies. The first stage is formed by a chamber with concentrated 265 nm UVC generated by two rings of UVC leds, the second stage formed by a chamber with a labyrinth to allow maximum exposure of the air by microwaves generated by 2 magnetrons, the third stage is formed with concentrated 265 nm UVC generated by two rings of UVC leds. There are also HEPA filters at both the inlet and outlet of the unit. The unit can be configured to be free standing without specialized installation required or can be hardwired into a circuit. Only the stand-alone unit incorporates a telescoping inlet to the height to be adjusted up to 12 feet.

An air sterilization system utilizing three stages of sterilization using UVC and microwave energy created by one or more magnetrons powered by solid state high voltage supplies. The first stage is formed by a chamber with concentrated 265 nm UVC generated by two rings of UVC leds, the second stage formed by a chamber with a labyrinth to allow maximum exposure of the air by microwaves generated by 2 magnetrons, the third stage is formed with concentrated 265 nm UVC generated by two rings of UVC leds. There are also HEPA filters at both the inlet and outlet of the unit. The unit can be configured to be free standing without specialized installation required or can be hardwired into a circuit. Only the stand-alone unit incorporates a telescoping inlet to the height to be adjusted up to 12 feet.

A critical area recirculation and exhaust system for a room operates in a normal operating mode where fresh air is delivered from an air handler through a diffuser and returned to the air handler through a room return duct. In a selected isolation operating mode, a fan filter unit is activated to draw contaminated air from the room through one or more filters and to expel the filtered air through the diffuser and through an exhaust air duct to create an increased air change rate and a negative pressure in the room.

A critical area recirculation and exhaust system for a room operates in a normal operating mode where fresh air is delivered from an air handler through a diffuser and returned to the air handler through a room return duct. In a selected isolation operating mode, a fan filter unit is activated to draw contaminated air from the room through one or more filters and to expel the filtered air through the diffuser and through an exhaust air duct to create an increased air change rate and a negative pressure in the room.

A single-package air conditioning appliance includes a housing defining an outdoor portion and an indoor portion. An outdoor heat exchanger assembly is disposed in the outdoor portion. The outdoor heat exchanger assembly includes an outdoor heat exchanger and an outdoor fan. An indoor heat exchanger assembly is disposed in the indoor portion. The indoor heat exchanger assembly includes an indoor heat exchanger and an indoor fan. A compressor is in fluid communication with the outdoor heat exchanger and the indoor heat exchanger to circulate a refrigerant between the outdoor heat exchanger and the indoor heat exchanger. The single-package air conditioner unit also includes a make-up air module. The make-up air module extends between the outdoor portion of the housing and an outside of the housing. The make-up air module includes a plurality of make-up air fans.

A single-package air conditioning appliance includes a housing defining an outdoor portion and an indoor portion. An outdoor heat exchanger assembly is disposed in the outdoor portion. The outdoor heat exchanger assembly includes an outdoor heat exchanger and an outdoor fan. An indoor heat exchanger assembly is disposed in the indoor portion. The indoor heat exchanger assembly includes an indoor heat exchanger and an indoor fan. A compressor is in fluid communication with the outdoor heat exchanger and the indoor heat exchanger to circulate a refrigerant between the outdoor heat exchanger and the indoor heat exchanger. The single-package air conditioner unit also includes a make-up air module. The make-up air module extends between the outdoor portion of the housing and an outside of the housing. The make-up air module includes a plurality of make-up air fans.

An apparatus, system and method for controlling airflow is described. The apparatus comprises a wall which delimits a flared bore. The apparatus further comprises at least one air guide member which retractably protrudes into the flared bore from the wall. The flared bore widens to an outlet, thereby to permit a diverging airflow to be expelled therefrom when each of the at least one air guide member is retracted. When the at least one air guide member protrudes into the flared bore, air flowing in the flared bore is guided by a surface, e.g. a concave surface, of the respective air guide member away from the wall and towards the outlet. The retractable air guide member thus enables the direction and/or degree of convergence of the air flowing out of the outlet to be controlled.

A register box for an HVAC installation has a body with a plurality of side panels arranged in a generally rectangular or square configuration and a wall extending in generally transverse relation to the plurality of side panels, and an expandable polymeric material affixed to an inner side of the side panels and across the wall. The wall has a plurality of concentric circular areas cut into the wall. Each of the concentric areas is formed of a first partial circle having ends in spaced relation to a second partial circle. The circular area can be removed from the wall so as to allow a user to cut through the polymeric material at the wall so as to form a hole opening to an interior of the register box. This hole can receive a collar therein. The collar can be connected to the HVAC system.