An economizer controller calibration method, comprising: sealing an economizer perimeter gap between the economizer frame and a Heating, Ventilating Air Conditioning (HVAC) system cabinet to reduce an uncontrolled outdoor airflow; determining a functional relationship between an economizer actuator voltage (x) and a damper position Outdoor Airflow Fraction (OAF) (y); monitoring the economizer actuator voltage (x) and measuring at least one airflow characteristic to calculate the damper position OAF (y) and obtain a set of x-versus-y data for at least two damper positions: closed, intermediate, and fully-open; calculating at least two coefficients of the functional relationship using the x-versus-y data; calculating a target economizer actuator voltage (x.sub.t) as a function of a required OAF.sub.r (y.sub.r) using the functional relationship; and positioning the damper using the target economizer actuator voltage (x.sub.t) to provide the target damper position OAF.sub.r (y.sub.r) within a tolerance of the required OAF.sub.r (y.sub.r).

An air conditioner includes a main body including a body fan, a heat exchanger, and a body housing. A ventilation hose connects the main body to outdoor air. A ventilation module is attached to an outer side of the body housing, and includes a ventilation fan. The ventilation module switches between an exhaust mode in which indoor air is exhausted to the outdoors through the ventilation hose and an air supply mode in which outdoor air is supplied to the main body through the ventilation hose.

Systems and methods for air flow circulation are described which utilize one or more air conditioning units as well as transfer grilles to move cooler air from one space to another. The transfer grilles can include bi-directional in-line fans to move air between spaces in discrete ducts located between the spaces. Motorized dampers can be controlled by a controller that receives information about various rooms and areas from temperature and occupancy sensors within those rooms or areas. In this manner, conditioned air can be directed to those rooms that are occupied and whose temperature needs correction based on a thermostat setting, and use of the air conditioning unit can be avoided when a cool air source is present in another space.

An economizer controller calibration method, comprising: sealing an economizer perimeter gap between the economizer frame and a Heating, Ventilating Air Conditioning (HVAC) system cabinet to reduce an uncontrolled outdoor airflow; determining a functional relationship between an economizer actuator voltage (x) and a damper position Outdoor Airflow Fraction (OAF) (y); monitoring the economizer actuator voltage (x) and measuring at least one airflow characteristic to calculate the damper position OAF (y) and obtain a set of x-versus-y data for at least two damper positions: closed, intermediate, and fully-open; calculating at least two coefficients of the functional relationship using the x-versus-y data; calculating a target economizer actuator voltage (x.sub.t) as a function of a required OAF.sub.r (y.sub.r) using the functional relationship; and positioning the damper using the target economizer actuator voltage (x.sub.t) to provide the target damper position OAF.sub.r (y.sub.r) within a tolerance of the required OAF.sub.r (y.sub.r).

Systems and methods for air flow circulation are described which utilize one or more air conditioning units as well as transfer grilles to move cooler air from one space to another. The transfer grilles can include bi-directional in-line fans to move air between spaces in discrete ducts located between the spaces. Motorized dampers can be controlled by a controller that receives information about various rooms and areas from temperature and occupancy sensors within those rooms or areas. In this manner, conditioned air can be directed to those rooms that are occupied and whose temperature needs correction based on a thermostat setting, and use of the air conditioning unit can be avoided when a cool air source is present in another space.

The device to control air flow direction in the air duct according to the invention, which has an air duct and is provided with a working machine in the form of a fan or turbine, is characterized by a working machine that is located in the profiled damper (3). This is a profiled single plane rotary baffle, in which there is a central hole and two embossings forming two canopies: the suction/inlet canopy (3a) and the compression/outlet canopy (3b), arranged in such a way that they are located on opposite sides of the plane of the baffle, while the canopies (3a), (3b) have the shape of the rotary bodies with a common axis of rotation coinciding with the axis of rotation of the profiled damper (3), and are so interposed that the central hole is in the plane perpendicular to the plane of the profiled damper (3), and perpendicular to the axis of rotation of the profiled damper (3). The profiled damper (3) rotates pendulously at an angle of no more than 180 degrees, and in extreme positions, through contact of the edge (4) to the partition/sealing shelf (2), separates the upper part (1a) from the lower part (1b) of the air duct (I). With the angle of rotation of no more than 180 degrees, the position of the canopies (3a, 3b), relative to the air duct (1), changes so that the canopy that was in the upper part of the air duct is moved to its lower part and the canopy that was in the lower part of the air duct (1) is moved to its upper part.

An air purification apparatus (100) for purifying air in a target space external to the apparatus is disclosed that comprises at least one pollutant removal structure (130; 131, 132) for removing a pollutant from the air in fluid connection with a major vent (110) and a directional vent arrangement comprising a directional inlet (112) for drawing air into the air purification apparatus from a region of the target space in an aiming direction of the directional inlet; and a directional outlet (114) for expelling air in a further aiming direction towards the region. An air movement device (120; 121, 122) configured to move air from the directional inlet to the major vent in a first configuration and to move air from the major vent to the directional outlet through the at least one pollutant removal structure in a second configuration responsive to a controller (150) is also present, as well as a sensor (140) arranged to determine a concentration of the pollutant in the air in said region when the air movement device is in the first orientation, wherein the controller is responsive to the sensor and is adapted to switch the air movement device from the first configuration to the second configuration upon the concentration of the pollutant exceeding a defined pollutant concentration threshold.

Systems and methods for air flow circulation are described which utilize one or more air conditioning units as well as transfer grilles to move cooler air from one space to another. The transfer grilles can include bi-directional in-line fans to move air between spaces in discrete ducts located between the spaces. Motorized dampers can be controlled by a controller that receives information about various rooms and areas from temperature and occupancy sensors within those rooms or areas. In this manner, conditioned air can be directed to those rooms that are occupied and whose temperature needs correction based on a thermostat setting, and use of the air conditioning unit can be avoided when a cool air source is present in another space.

An air handling device includes a plurality of tunnels defining a plurality of separate air flow pathways. At least one tunnel of the plurality of tunnels is an active tunnel and at least one tunnel of the plurality of tunnels is a redundant tunnel. The air handling device further includes a first air select at a first end of the plurality of tunnels and a second air select on a second end of the plurality of tunnels, wherein the first end is opposite to the second end. The air handling device also includes a plurality of dampers within each of the first and second air selects, wherein the plurality of dampers are configured to change an air flow therein to block air flow through the active tunnel and allow air flow through the redundant tunnel.

An air conditioning appliance may include an air plenum, a recovery casing, a first recovery exhaust fan, a heat exchanger core, and a thermal cutoff. The recovery casing may be attached to the air plenum. The recovery casing may define an outdoor casing inlet downstream from the air plenum and an indoor casing outlet downstream from the outdoor casing inlet along an external recovery flow path. The recovery casing may further define an indoor casing inlet and an outdoor casing outlet along an internal recovery flow path. The first recovery exhaust fan may be mounted within the recovery casing along the external recovery flow path. The heat exchanger core may be disposed along the external recovery flow path and the internal recovery flow path. The thermal cutoff may be mounted within the recovery casing in operable communication with the first recovery exhaust fan.