A system for passively exhausting air from a structure includes at least one pair of modules arranged on a roof of the structure. Each module has an exhaust face on one side and a sloped surface on the opposite side, and can receive exhaust air that flows upward from inside the structure. The modules can be arranged in pairs facing one another, with one of the sloped surfaces facing a direction of an environmental flow of air, so that the environmental air can flow up the sloped surface of one module and down the sloped surface of the other module without impinging on the exhaust faces of either module. The pairs can also be arranged side-by-side in an array, which can be expanded with additional pairs of modules to exhaust from the structure at a greater rate.

A multifunction adaptive whole house fan system can include a whole house fan to pull large volume of air through a building structure. The whole house fan can pull air from a window or damper into the building structure and expel air through an attic. The system can monitor the environment to operate the whole house fan when desired conditions are present in coordination with other systems of the building structure to reduce overall energy consumption.

A method, system, apparatus, and/or device for preheating air for a rooftop air handling unit (RTU). The method, system, apparatus, and/or device may include a barrier system configured to surround the RTU. The barrier system may include a structure to provide a frame for the barrier system, a first barrier configured to connect to a first side of the structure, and a collector configured to connect to a second side of the structure. The method, system, apparatus, and/or device may include a duct configured to connect between the collector and a chamber. The method, system, apparatus, and/or device may include a chamber configured to connect to an air intake hood of the RTU. The chamber may include a first opening to receive air stored in the cavity, a second opening to receive external air, and a diverter configured to switch between a first position and a second position.

An air handling unit can include a first airflow passage and a second airflow passage having separate entrances. A cooling module can be arranged in the second airflow passage for cooling air passing there through. A cover, blocker, or other barrier can move between a position at least partially blocking the first entrance to the first airflow passage and at least partially blocking the second entrance to the second airflow passage. In various aspects, the barrier can be moved to intermediate positions to affect a ratio of air flowing through each of the passages and to thus control an overall amount of cooling provided to discharged air that corresponds to a mixture of the air directed through the cooling module and the air directed around the cooling module, which may be mixed together upon exiting the separate passages.

An air handling unit can include a first airflow passage and a second airflow passage having separate entrances. A cooling module can be arranged in the second airflow passage for cooling air passing there through. A cover, blocker, or other barrier can move between a position at least partially blocking the first entrance to the first airflow passage and at least partially blocking the second entrance to the second airflow passage. In various aspects, the barrier can be moved to intermediate positions to affect a ratio of air flowing through each of the passages and to thus control an overall amount of cooling provided to discharged air that corresponds to a mixture of the air directed through the cooling module and the air directed around the cooling module, which may be mixed together upon exiting the separate passages.

A manifold assembly includes a body and a damper assembly. The body defines a first opening, a second opening, outlet third opening, and a fluid plenum. The fluid plenum fluidly couples the first opening, the second opening, and the third opening. The damper assembly includes a first damper, a second damper, and a connecting member. The first damper is disposed within the fluid plenum proximate to the first opening. The second damper is disposed within the fluid plenum proximate to the second opening. The connecting member is coupled to both the first damper and the second damper and is configured to move the first damper and the second damper to selectively open one of the first opening or the second opening while closing the one not opened.

A manifold assembly includes a body and a damper assembly. The body defines a first opening, a second opening, outlet third opening, and a fluid plenum. The fluid plenum fluidly couples the first opening, the second opening, and the third opening. The damper assembly includes a first damper, a second damper, and a connecting member. The first damper is disposed within the fluid plenum proximate to the first opening. The second damper is disposed within the fluid plenum proximate to the second opening. The connecting member is coupled to both the first damper and the second damper and is configured to move the first damper and the second damper to selectively open one of the first opening or the second opening while closing the one not opened.

A manifold assembly includes a body and a damper assembly. The body defines a first opening, a second opening, outlet third opening, and a fluid plenum. The fluid plenum fluidly couples the first opening, the second opening, and the third opening. The damper assembly includes a first damper, a second damper, and a connecting member. The first damper is disposed within the fluid plenum proximate to the first opening. The second damper is disposed within the fluid plenum proximate to the second opening. The connecting member is coupled to both the first damper and the second damper and is configured to move the first damper and the second damper to selectively open one of the first opening or the second opening while closing the one not opened.

A manifold assembly includes a body and a damper assembly. The body defines a first opening, a second opening, outlet third opening, and a fluid plenum. The fluid plenum fluidly couples the first opening, the second opening, and the third opening. The damper assembly includes a first damper, a second damper, and a connecting member. The first damper is disposed within the fluid plenum proximate to the first opening. The second damper is disposed within the fluid plenum proximate to the second opening. The connecting member is coupled to both the first damper and the second damper and is configured to move the first damper and the second damper to selectively open one of the first opening or the second opening while closing the one not opened.

A dust suction device includes: a main body composed of a bottom plate and a footboard, wherein a dust suction part is formed in the bottom plate, and the footboard seals the dust suction part and has suction holes formed on the upper part thereof to allow the dust to be sucked to the dust suction part; a number of springs provided on the bottom inside the bottom plate matching the number of suction holes; balls which are provided on the upper part of the springs and which are in close contact with the suction holes of the footboard and open and close the suction holes; and a suction part which is connected to a side portion of the main body through a hose and sucks the dust through the suction holes toward the dust suction part when the suction holes are open.