Abstract: There is disclosed an environmental control system for a large volume structure (one horizontal dimension of at least 60 feet) having an air tempering unit including a horizontal cylindrical duct of about three feet diameter with an axial flow propeller fan and motor placed in one end to draw air through the duct and a gaseous fuel burner upstream from the fan with oxygen supplied from the air stream and with combustion products thereof being propelled through the fan. A series of propeller-fan air movers are placed in the structure near ceiling level with the first of the air movers placed about 25 to 50 feet in front of the air tempering unit. The air tempering unit and the air movers are operated by a control unit in response to a cycle timer and various sensor elements including an air velocity sensor for outside air supplied to the air tempering unit and an internal air temperature sensor.

Abstract: There is disclosed an environmental control system for a large volume structure (one horizontal dimension of at least 60 feet) having an air tempering unit including a horizontal cylindrical duct of about three feet diameter with an axial flow propellor fan and motor placed in one end to draw air through the duct and a gaseous fuel burner upstream from the fan with oxygen supplied from the air stream and with combustion products thereof being propelled through the fan. A series of propeller-fan air movers are placed in the structure near ceiling level with the first of the air movers placed about 25 to 50 feet in front of the air tempering unit. The air tempering unit and the air movers are operated by a control unit in response to a cycle timer and various sensor elements including an air velocity sensor for outside air supplied to the air tempering unit and an internal air temperature sensor.

Abstract: A method is disclosed for providing a poultry house or other livestock enclosure with an environment favorable for animal growth and unfavorable to propagation of microorganisms which includes starting the grow out cycle with the birds confined to about one-quarter of the enclosure and expanding the area with increasing body weight while keeping the body weight to area at least one pound per square foot; injecting tempered outside air mixed with inside air through an air jet device into said enclosure at a temperature below enclosure air temperature and at a velocity of about 10,000 cubic feet per minute with intermittent operation having a maximum duty factor of about 0.4 and a periodicity of about ten minutes. When outside air temperature is below 30.degree. F.

Abstract: A heating-ventilating system including an air duct adapted to be installed in an exterior wall of a poultry house and having a fan mounted near the interior end of the duct and a fuel burner mounted in the duct upstream from said fan, the fuel burner being adapted to burn fuel efficiently in the high velocity air flow provided by the fan; an automatic damper upstream of the burner controlled by the pressure differential across the burner; an igniter including an electric spark generator and a starter-maintainer jet forward thereof for igniting the burner in response to an electrical signal; a controller for the fan which operates the fan alone in response to a warmer than desired temperature in the poultry house, which causes the fan to turn off at a desired temperature range in the poultry house, and which causes the fan to operate in conjunction with the fuel burner for lower than desired temperatures; and a curtain opening controller for automatic adjustment of curtains responsive to the fan burner control

Abstract: A heating-ventilating system including an air duct adapted to be installed in an exterior wall of a poultry house and having a fan mounted near the interior end of the duct and a fuel burner mounted in the duct upstream from said fan, the fuel burner being adapted to burn fuel efficiently in the high velocity air flow provided by the fan; an igniter including an electric spark generator for igniting the burner in response to an electrical signal, a first stage fuel control valve and a second stage fuel control valve with the main fuel control valve responding to a flame sensor and to a thermostat in the interior of the poultry house and the second stage fuel control valve responding to a second independent thermostat; a control for the fan which operates the fan alone in response to a warmer than desired temperature in the poultry house, which causes the fan to turn off at a desired temperature range in the poultry house, and which causes the fan to operate in conjunction with the fuel burner for lower than d