A ventilator door brings fresh outside air into a structure through an outside opening and a fan or blower pulls outside air into a duct in the door. The air flows through the duct and into the structure through an inside grill remote from the outside opening. Heat is transferred from the flow of air to a heat sink disposed in the duct to cool the fresh air flowing into the duct. A regenerative heat sink may be used to capture heat from a flow of air from inside the structure and transfer the captured heat to a flow of outside air flowing into the structure. An inside opening in the door generally opposite to the outside opening. The air flow through the openings is controlled by movable panels by aligning or by misaligning openings in the movable panels with the openings in the outside and inside panels. A microprocessor controls the movable panels and the fan or blower in response to sensors inside and outside of the door.

A panel assembly includes two frame members and a plurality of panels extending between the frame members. Each panel has fastening elements at either end. The fastening elements are arranged to clip onto mating portions of the frame members, and are also arranged to frictionally engage internal surfaces of the panels to thereby hold the panels relative to the frame members.

A louvered panel assembly restricts the ingress of contaminants into an enclosure. The louvered panel assembly includes a first louvered panel, a second louvered panel, and a third louvered panel. The first louvered panel has a first plurality of louvers extending arcuately, downwardly, and outwardly from a first plate. The second louvered panel is coupled to the first louvered panel and has a second plurality of louvers extending arcuately, downwardly, and inwardly away from a second plate that is spaced apart from the first plate. The third louvered panel is coupled to the second louvered panel and has a third plurality of louvers extending arcuately, upwardly, and inwardly away from a third plate that is spaced apart from and extends approximately parallel to the second plate.

A hollow core door apparatus for preventing the build up of pressure in a room includes an inside door skin and an outside door skin, and the door skins include openings through which air flows. A center panel is disposed between and spaced apart from the skins. The center panel has an outer perimeter defined by notches through which air flows. Tabs between the notches are used to secure the center panel to the inside and outside door skins. Air flow from the room is through the opening in the inside skin, around the outer perimeter of the panel, and outwardly from the door and room through the outside skin in a non-linear manner. Air flow is controlled by a plurality of movable panels disposed adjacent to the outer perimeter of the center panel. Sensor elements for sensing desired information and for providing output signals, including signals for actuating the movable panels, are included.

A hollow core door apparatus for preventing the build up of pressure in a room includes an inside door skin and an outside door skin, and the door skins include openings through which air flows. A center panel is disposed between and spaced apart from the skins. The center panel has an outer perimeter defined by notches through which air flows. Tabs between the notches are used to secure the center panel to the inside and outside door skins. Air flow from the room is through the opening in the inside skin, around the outer perimeter of the panel, and outwardly from the door and room through the outside skin in a non-linear manner. Air flow is controlled by a plurality of movable panels disposed adjacent to the outer perimeter of the center panel. Sensor elements for sensing desired information and for providing output signals, including signals for actuating the movable panels, are included.

Hollow core door apparatus for preventing the build up of pressure in a room includes an inside door skin and an outside door skin, and the door skins include openings through which air flows. A center panel is disposed between and spaced apart from the skins. The center panel has an outer perimeter defined by notches through which air flows. Tabs between the notches are used to secure the center panel to the inside and outside door skins. Air flow from the room is through the opening in the inside skin, around the outer perimeter of the panel, and outwardly from the door and room through the outside skin in a non-linear manner. Air flow is controlled by a plurality of movable panels disposed adjacent to the outer perimeter of the center panel. Sensor elements for detecting aspects of the indoor environment and for providing output signals, including signals for actuating the movable panels, are included. A method of making the door follows the structural elements defined above.

Hollow core door apparatus for preventing the build up of pressure in a room includes an inside door skin and an outside door skin, and the door skins include openings through which air flows. A center panel is disposed between and spaced apart from the skins. The center panel has an outer perimeter defined by notches through which air flows. Tabs between the notches are used to secure the center panel to the inside and outside door skins. Air flow from the room is through the opening in the inside skin, around the outer perimeter of the panel, and outwardly from the door and room through the outside skin in a non-linear manner. Air flow is controlled by a plurality of movable panels disposed adjacent to the outer perimeter of the center panel. Sensor elements for detecting aspects of the indoor environment and for providing output signals, including signals for actuating the movable panels, are included. A method of making the door follows the structural elements defined above.

Doors having stile and rail frames and center elements secured to the stile and rail frames and the center elements have margins inwardly where the center elements and the door frames overlap and openings extend through the margins outwardly from openings in skins, and inside and outside skins are secured to the stile and rail frames. The inside and outside skins have openings adjacent to and laterally or inwardly spaced apart from the openings through the margins whereby air flows through the openings in the inside skin, through the openings in the margins, and through the openings in the outside skin in a non-linear manner to prevent pressure build up in rooms to comply with the Department of Energy maximum recommended room pressure of three pascals or less.

Improvements in the manufacture, mounting and implementation of dry open window (DOW) structures. Such structures comprise a plurality of louvers which, when viewed in cross section, have V or W shapes that enable air to pass through a window opening while substantially preventing precipitation to pass, the precipitation instead being captured by the louvers for collection or drainage.

Improvements in the manufacture, mounting and implementation of dry open window (DOW) structures. Such structures comprise a plurality of louvers which, when viewed in cross section, have V or W shapes that enable air to pass through a window opening while substantially preventing precipitation to pass, the precipitation instead being captured by the louvers for collection or drainage.