A recessed window assembly comprises a housing configured for recessed installation within a frame wall of a building adjacent a window opening and at least two sliding window components slidingly disposed within the housing such that the sliding window components are at least substantially disposed within the housing when in a non-deployed position and that fill the window opening when in a deployed position. The window components can comprise, for example, a transparent untinted window, a transparent tinted window, a translucent window, a window screen, a security plate, an electric fan, or an air filter.

An assembly for closing an opening comprising a door panel adapted for sliding movement between an open position and a closed position, a first extendable member located at a first edge of the opening and extendable towards an opposed second edge of the opening, and a second extendable member located at the second edge of the opening and extendable towards the first edge of the opening, and wherein the door panel includes a stop member attached thereto and movable therewith, the location of the stop member defining the limit of movement of the first extendable member towards the second edge of the opening, and the limit of movement of the second extendable member towards the first edge of the opening.

An assembly for closing an opening comprising a door panel adapted for sliding movement between an open position and a closed position, a first extendable member located at a first edge of the opening and extendable towards an opposed second edge of the opening, and a second extendable member located at the second edge of the opening and extendable towards the first edge of the opening, and wherein the door panel includes a stop member attached thereto and movable therewith, the location of the stop member defining the limit of movement of the first extendable member towards the second edge of the opening, and the limit of movement of the second extendable member towards the first edge of the opening.

A wind turbine tower includes a door access opening in a down tower area of the tower. A hinged door panel covers the door access opening, with a ventilation opening defined through the door panel. A multi-sided intake structure, such as a box-like structure, is connected to an exterior of the door panel over the first ventilation opening. The intake structure extends transversely from the door panel and includes a top side, a bottom side, and at least two vertical sides extending between the top side and the bottom side. The vertical sides are open to air flow therethrough. The top and bottom sides may also be open to air flow therethrough. Air from multiple directions is drawn into an interior of the wind turbine tower through the intake structure and ventilation opening. A filtering system with first and second stage filters may be incorporated with any of the intake structures.

A wind turbine tower includes a door access opening in a down tower area of the tower. A hinged door panel covers the door access opening, with a ventilation opening defined through the door panel. A multi-sided intake structure, such as a box-like structure, is connected to an exterior of the door panel over the first ventilation opening. The intake structure extends transversely from the door panel and includes a top side, a bottom side, and at least two vertical sides extending between the top side and the bottom side. The vertical sides are open to air flow therethrough. The top and bottom sides may also be open to air flow therethrough. Air from multiple directions is drawn into an interior of the wind turbine tower through the intake structure and ventilation opening. A filtering system with first and second stage filters may be incorporated with any of the intake structures.

Various air conditioner systems and methods are presented. An air ventilation chamber assembly may include a first chamber and a second chamber through which air is circulated into an environment to be cooled. A cooling element of a heat pump, may pass through the first chamber of the air ventilation chamber assembly, wherein the cooling element does not pass through the second chamber of the air ventilation chamber assembly. A Peltier cooler may be present that has a cold side and a hot side. The cold side may be is thermodynamically coupled with a surface of the second chamber.

A wind turbine tower includes a door access opening in a down tower area of the tower. A hinged door panel covers the door access opening, with a ventilation opening defined through the door panel. A multi-sided intake structure, such as a box-like structure, is connected to an exterior of the door panel over the first ventilation opening. The intake structure extends transversely from the door panel and includes a top side, a bottom side, and at least two vertical sides extending between the top side and the bottom side. The vertical sides are open to air flow therethrough. The top and bottom sides may also be open to air flow therethrough. Air from multiple directions is drawn into an interior of the wind turbine tower through the intake structure and ventilation opening. A filtering system with first and second stage filters may be incorporated with any of the intake structures.

A wind turbine tower includes a door access opening in a down tower area of the tower. A hinged door panel covers the door access opening, with a ventilation opening defined through the door panel. A multi-sided intake structure, such as a box-like structure, is connected to an exterior of the door panel over the first ventilation opening. The intake structure extends transversely from the door panel and includes a top side, a bottom side, and at least two vertical sides extending between the top side and the bottom side. The vertical sides are open to air flow therethrough. The top and bottom sides may also be open to air flow therethrough. Air from multiple directions is drawn into an interior of the wind turbine tower through the intake structure and ventilation opening. A filtering system with first and second stage filters may be incorporated with any of the intake structures.

A panel in an overhead door system having a rigid outer frame with an aperture therethrough dimensioned to receive a plurality of movable, foldable horizontally hinged sub-panels dimensioned to fit within confines of the aperture of such outer frame when closed and a plurality of movable, foldable horizontally hinged sub-panels dimensioned to fit within the confines of the aperture of such outer frame when closed, said sub-panels being an upper sub-panel, a first sub-panel, a second sub-panel and a lower sub-panel, the upper sub-panel coupled along its lower horizontal edge to the top horizontal edge of the first sub-panel, the first sub-panel being coupled along its lower horizontal edge to the top horizontal edge of the second subpanel, and the lower horizontal edge of the second subpanel being coupled to the top horizontal edge of the lower sub-panel and including a pin, roller or track system.

A panel in an overhead door system having a rigid outer frame with an aperture therethrough dimensioned to receive a plurality of movable, foldable horizontally hinged sub-panels dimensioned to fit within confines of the aperture of such outer frame when closed and a plurality of movable, foldable horizontally hinged sub-panels dimensioned to fit within the confines of the aperture of such outer frame when closed, said sub-panels being an upper sub-panel, a first sub-panel, a second sub-panel and a lower sub-panel, the upper sub-panel coupled along its lower horizontal edge to the top horizontal edge of the first sub-panel, the first sub-panel being coupled along its lower horizontal edge to the top horizontal edge of the second subpanel, and the lower horizontal edge of the second subpanel being coupled to the top horizontal edge of the lower sub-panel and including a pin, roller or track system.