Abstract: A zoned variable volume system is provided with a pair of non-connected dampers in each zone. The first damper controls flow through a cooling coil. The second damper controls flow through a heating coil and provides heated or neutral air depending upon whether or not the heating coil is actuated. The fan speed is adjusted to cause at least one damper to be fully open so that the system operates at a minimum static pressure. The system is adapted to provide tenant metering by determining the amount of conditioned air provided to each zone. Each zone is controlled through a single temperature and flow sensor.

Abstract: A zoned variable volume system is provided with a pair of non-connected dampers in each zone. The first damper controls flow through a cooling coil. The second damper controls flow through a heating coil and provides heated or neutral air depending upon whether or not the heating coil is actuated. The fan speed is adjusted to cause at least one damper to be fully open so that the system operates at a minimum static pressure.

Abstract: A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate the flow of cool and neutral or warm air to each zone individually and to control the total amount of air supplied to all of the zone.

Abstract: A planar venturi is located at the discharge of an air conditioning unit to form a part of the unit and to stabilize flow. A plurality of sensor locations are provided in the diverging portion of the venturi such that a velocity sensor can be located in the sensor location appropriate for the highest range of sensor accuracy. The velocity is a measure of the volume flow which is the product of the cross section of the flow at the sensor location and the sensed velocity.

Abstract: A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate the flow of cool and neutral or warm air to each zone individually and to control the total amount of air supplied to all of the zone.

Abstract: A vane axial fan assembly includes a housing defining a chamber to receive a fluid discharged from the blades of the vane axial fan. The housing includes a substantially spiral shaped scroll portion defining a chamber of substantially constantly increasing radius and having a substantially spiral shaped baffle member mounted within said chamber and combining to define therewith a simultaneously radially and axially expanding fluid flow passage for receiving the fluid discharged from the blades of the fan.