Provided is an indoor ventilation system which can ventilate an indoor space even without opening a glazed window. A ventilation window includes an opening which is formed through a glass plate thereof and can be opened or blocked. In the system, only a space corresponding to the opening is open to the outside so as to ventilate an indoor space without a glazed window, an open area of the opening is narrow so as to be secure against outside invasion and a falling accident, and a perimeter of a frame is short so as to minimize energy loss.

Disclosed herein are methods, systems, and devices for allowing access for maintenance and servicing of environmental control systems of prefabricated equipment enclosures. In one embodiment, an enclosure includes a first wall, a first environmental control unit, and a first door. The first door is mechanically coupled with the first environmental control unit and the first wall. The first door is configured to have a first closed position allowing in-service operation of the first environmental control unit for an internal space of the enclosure.

The application provides a fresh air purification window for preventing haze. A ventilation device is provided with an upper layer and a lower layer and partitioned by a transverse middle-layer partition plate, an exhaust fan is mounted in the upper layer, an air feeder is mounted in the lower layer, an air inlet grille is formed on the upper layer through front-layer glass, and a half-closed space with an air cavity unidirectionally provided with an exhaust opening is formed by the upper layer, upper-layer glass, a middle-layer separation partition plate and air cavity one-sided glass. The fresh air purification window has the effects of lowering the shielding light ray of the current purification window and enabling the current purification window to be compact in structure.

A ceiling system is provided that has a ceiling structure suspended within a space of a building thereby dividing the space into an occupied space below the ceiling structure and a plenum space above the ceiling structure; a panel structure supported by the ceiling structure and having an opening; a pressurized air passageway aligned with the opening, the pressurized air passageway having an outlet; and an inductive air passageway adjacent the pressurized air passageway, the inductive air passageway having an inlet and an outlet. The pressurized air passageway and the inductive air passageway are configured such that pressurized air passing through the outlet of the pressurized air passageway induces an induced air flow out of the outlet of the inductive air passageway.

A ceiling system is provided that has a ceiling structure suspended within a space of a building thereby dividing the space into an occupied space below the ceiling structure and a plenum space above the ceiling structure; a panel structure supported by the ceiling structure and having an opening; a pressurized air passageway aligned with the opening, the pressurized air passageway having an outlet; and an inductive air passageway adjacent the pressurized air passageway, the inductive air passageway having an inlet and an outlet. The pressurized air passageway and the inductive air passageway are configured such that pressurized air passing through the outlet of the pressurized air passageway induces an induced air flow out of the outlet of the inductive air passageway.

An indoor and outdoor ventilation device includes a fan, an air inlet casing, and an exhaust window. The fan is installed on an indoor side. The air inlet casing and the exhaust window installed on an outdoor side. An air inlet and an air outlet are arranged on the air inlet casing. The fan is communicated with the air outlet. A filter net and an air filter are sequentially installed in the air inlet casing from the air inlet to the air outlet. The exhaust window is mounted on a wall body for communication with indoor air and outside air.

An indoor and outdoor ventilation device includes a fan, an air inlet casing, and an exhaust window. The fan is installed on an indoor side. The air inlet casing and the exhaust window installed on an outdoor side. An air inlet and an air outlet are arranged on the air inlet casing. The fan is communicated with the air outlet. A filter net and an air filter are sequentially installed in the air inlet casing from the air inlet to the air outlet. The exhaust window is mounted on a wall body for communication with indoor air and outside air.

Described is a louver having a frame that forms an enclosure defining an opening, and a plurality of louver blades disposed within the opening. The louver further includes an elongated member disposed within the frame and in contact with the plurality of louver blades. The elongated member has a body that longitudinally extends between a first member end and a second member end, wherein the first member end and the second member end are fixedly connected to opposing sections of the frame. The described louver may provide improved wind-driven rain resistance and/or impact resistance.

Described is a louver having a frame that forms an enclosure defining an opening, and a plurality of louver blades disposed within the opening. The louver further includes an elongated member disposed within the frame and in contact with the plurality of louver blades. The elongated member has a body that longitudinally extends between a first member end and a second member end, wherein the first member end and the second member end are fixedly connected to opposing sections of the frame. The described louver may provide improved wind-driven rain resistance and/or impact resistance.

Described is a louver having a frame that forms an enclosure defining an opening, and a plurality of louver blades disposed within the opening. The louver further includes an elongated member disposed within the frame and in contact with the plurality of louver blades. The elongated member has a body that longitudinally extends between a first member end and a second member end, wherein the first member end and the second member end are fixedly connected to opposing sections of the frame. The described louver may provide improved wind-driven rain resistance and/or impact resistance.