A backdraft damper for permitting a flow of air in an outflow direction and preventing the flow of air in a backdraft direction, including a frame having a transverse opening allowing the passage of air through the frame; a plurality of blades, each blade extending across the frame and mounted to the frame about a central portion by pivot members, for rotation between an open position in which the blade allows air to flow through the frame and a closed position in which the blade blocks air from flowing through the frame, the plurality of blades including one or more first blades arranged to rotate in a first direction from the closed position to the open position; one or more second blades arranged to rotate in a second direction opposite to the first direction from the closed position to the open position; the backdraft damper further including a linkage between the one or more first blades and the one or more second blades to cause the first and second blades to together rotate between the closed and open positions; and the one or more second blades being more balanced about respective pivot members than the one or more first blades thereby to permit the one or more first blades to bias the entire plurality of blades to the closed position while being movable to the open position by the force of air flowing through the frame in the outflow direction.

Described is a louver having a frame that forms an enclosure defining an opening, and a plurality of louver blades disposed within the opening. Each of the plurality of louver blades include a catch member that longitudinally extends between a first blade end and a second blade end of a corresponding louver blade. The louver may also include a rotation assembly configured to rotatably couple with the plurality of louver blades and the frame. The plurality of louver blades may autonomously rotate about rotation members of the rotation assembly based on environmental elements captured in the catch member such that the plurality of louver blades are configured in an open position in response to no water in the catch member and are configured in a closed position in response to an amount of environmental elements in the catch member.

A damper includes first and second blade assemblies disposed next to one another and rotatably supported by a frame to rotate together between open and closed positions. Each of the first and second blade assemblies includes a shaft and first and second blades connected to the shaft. The first and second blade assemblies have respective first and second seal members connected to the blades thereof. In the closed position, the first seal member abuts the second blade assembly at a first contact point to form a first seal, and the second seal member abuts the second blade assembly at a second contact point to form a second seal. The first contact point is further from a blade rotation axis of the first blade assembly than the second contact point. The second contact point is further from a blade rotation axis of the second blade assembly than the first contact point.

A damper includes first and second blade assemblies disposed next to one another and rotatably supported by a frame to rotate together between open and closed positions. Each of the first and second blade assemblies includes a shaft and first and second blades connected to the shaft. The first and second blade assemblies have respective first and second seal members connected to the blades thereof. In the closed position, the first seal member abuts the second blade assembly at a first contact point to form a first seal, and the second seal member abuts the second blade assembly at a second contact point to form a second seal. The first contact point is further from a blade rotation axis of the first blade assembly than the second contact point. The second contact point is further from a blade rotation axis of the second blade assembly than the first contact point.

A heating, ventilation, and/or air conditioning (HVAC) system includes a damper assembly configured to regulate airflow and having a frame. The HVAC system includes a first damper blade piece having a first airfoil surface and a second damper blade piece having a second airfoil surface. The first damper blade piece and the second damper blade piece are configured to couple with the frame, and are configured to interlock with one another to form a damper blade having an airfoil shape.

A heating, ventilation, and/or air conditioning (HVAC) system includes a damper assembly configured to regulate airflow and having a frame. The HVAC system includes a first damper blade piece having a first airfoil surface and a second damper blade piece having a second airfoil surface. The first damper blade piece and the second damper blade piece are configured to couple with the frame, and are configured to interlock with one another to form a damper blade having an airfoil shape.

This document describes a high efficiency dehumidification system (HEDS) and method of operating the same. The HEDS systems and physical implementations can include a variety of equipment, such as fans, fluid-conveying coils, tubing and pipes, heat transfer coils, vents, louvers, dampers, valves, fluid chillers, fluid heaters, and/or the like. Any of the implementations described herein can also include controls and logic, responsive to one or more sensors or other input devices, for controlling the equipment for each implementation described herein. The HEDS system utilizes heat transfer between the fluid within the fluid-conveying coils and air passing over the coils to convert humid air into dehumidified air.

This document describes a high efficiency dehumidification system (HEDS) and method of operating the same. The HEDS systems and physical implementations can include a variety of equipment, such as fans, fluid-conveying coils, tubing and pipes, heat transfer coils, vents, louvers, dampers, valves, fluid chillers, fluid heaters, and/or the like. Any of the implementations described herein can also include controls and logic, responsive to one or more sensors or other input devices, for controlling the equipment for each implementation described herein. The HEDS system utilizes heat transfer between the fluid within the fluid-conveying coils and air passing over the coils to convert humid air into dehumidified air.

A dynamic register system automatically adjusts venting panels attached to an air vent in order to evenly disperse the air supplied by the vent in a room. The dynamic register system includes a fan internally mounted within the air vent. The air supplied by the air vent causes the fan to turn providing the system with mechanical energy. The fan is then attached to a gear system which in turn is attached to an adapter. The gear system then translates the rotational mechanical energy of the fan into an oscillating motion for the adapter. The adapter is then mounted to an axle which engages with the venting panels attached to the vent. As the adapter oscillates the axle is adjusted which in turn adjusts the venting panels periodically to evenly distribute air.

A dynamic register system automatically adjusts venting panels attached to an air vent in order to evenly disperse the air supplied by the vent in a room. The dynamic register system includes a fan internally mounted within the air vent. The air supplied by the air vent causes the fan to turn providing the system with mechanical energy. The fan is then attached to a gear system which in turn is attached to an adapter. The gear system then translates the rotational mechanical energy of the fan into an oscillating motion for the adapter. The adapter is then mounted to an axle which engages with the venting panels attached to the vent. As the adapter oscillates the axle is adjusted which in turn adjusts the venting panels periodically to evenly distribute air.