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An air circulation system includes an inflow system which includes a tube enclosure or cowl suspended from a ceiling of a room or from a roof above the room. The tube enclosure or cowl is fitted with a ceiling fan. An air supply unit external to the room (e.g., outdoors) includes an in flow fan conn

An air circulation system includes an inflow system which includes a tube enclosure or cowl suspended from a ceiling of a room or from a roof above the room. The tube enclosure or cowl is fitted with a ceiling fan. An air supply unit external to the room (e.g., outdoors) includes an in flow fan connected to air supply duct and a variable air volume box having an inlet connected to the air supply duct and an outlet connected to the interior of the tube enclosure or cowl. The system also includes an outflow system which includes an exhaust grill which may be either suspended from the ceiling or be fitted to the wall of the room. An exhaust riser duct is connected to the exhaust grill. An exhaust fan is connected to the outlet from the exhaust riser. The exhaust fan is operated in conjunction with the inflow fan to exhaust, via the outflow system, substantially all the volume of air inflowing through the air inflow system into the inside room through the outflow system. In this way the quality of air in the inside room is improved by impelling a selected volume of outdoor air downwardly into inside room air, circulating the outdoor air within the inside room and expelling the selected volume of used inside room air from the inside room, and by allowing the occupant of the inside room to adjust comfort conditions by varying air circulation and the selected volume of outdoor air.

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A system for improving the condition and quality of indoor air in an inside room space of a room comprising: (A) an inflow system comprising: (i) an outdoor air supply unit including an air supply discharge duct, an air supply inlet port communicating with said air supply discharge duct and a fan co

A system for improving the condition and quality of indoor air in an inside room space of a room comprising: (A) an inflow system comprising: (i) an outdoor air supply unit including an air supply discharge duct, an air supply inlet port communicating with said air supply discharge duct and a fan connected between said air supply inlet port and said air supply discharge duct for supplying outdoor air through said air supply inlet port into said air supply discharging duct; (ii) a variable air volume box having both an air intake connected to said air supply discharge duct and an air outflow duct, and means to control the volume of air discharged through said air outflow duct; (iii) a tube enclosure or cowl suspended from a ceiling of said room, said tube enclosure or cowl including a main air inlet port having an inlet which is connected to said air outflow duct, a discharge outlet port, and a depending ceiling fan positioned below said discharge outlet port whereby said tube enclosure or cowl feeds outdoor air to said ceiling fan to discharge said outdoor air downward into said inside room space; and (B) an outflow system comprising: (a) an exhaust grill connected to the ceiling or to a wall of said inside room adjacent the ceiling; (b) an exhaust riser duct connected to said exhaust grill; and (c) an exterior exhaust fan connected to an outlet from said exhaust riser; said exterior exhaust fan being operated in conjunction with said fan which is connected between said air supply inlet port and said air supply discharge duct to exhaust, via said outflow system, substantially all the volume of air inflowing through said air inflow system into said inside room space; thereby improving the quality of air in said inside room space by: impelling a selected volume of said outdoor air downwardly the air of inside room space air, circulating said outdoor air within said inside room space and expelling said selected volume of used room air from said inside room, and by allowing the occupant of said room space to adjust comfort conditions by varying air circulation and the selected volume of outdoor air.