Thermodynamically balanced heat regain system

Claim 1

A THERMOSTATIC BALANCED HEAT REGAIN SYSTEM FOR SUPPLYING A QUANTITY OF GAS TO CHAMBER FROM A SOURCE AND FOR EXHAUSING AN EQUAL QUANTITY BY WEIGHT OF SAID GAS FROM SAID CHAMBER TO SAID SOURCE, SAID SYSTEM COMPRISING EXHAUST DUCT MEANS AND SUPPLY DUCT MEANS ADAPTED TO BE CONNECTED IN PARALLEL BETWEEN SAID CHAMBER AND SOURCE, AN EXHAUST FAN IN SAID EXHAUST DUCT MEANS AND A SUPPLY FAN IN SAID SUPPLY DUCT MEANS, CONSTANT SPEED POWER MEANS DRIVINGLY CONNECTED TO SAID SUPPLY FAN SO AS TO DRIVE SAID SUPPLY FAN AT A CONSTANT SPEED, VARIABLE SPEED POWER MEANS DRIVINGLY CONNECTED TO SAID EXHAUST FAN FOR DRIVING SAID EXHAUST FAN AT VARIABLE SPEEDS, FIRST THERMOSTATIC CONTROL MEANS IN SAID EXHAUST DUCT MEANS EXPOSED TO AND HEATED BY THE EXHAUST GASES FLOWING THROUGH SAID EXHAUST DUCT MEANS, BOTH SAID FANS HAVING A CAPACITY TO MOVE AN EQUAL VOLUME OF SAID GAS PER UNIT TIME WHEN THE TEMPERATURE OF THE GAS IN SAID EXHAUST DUCT MEANS IS AT A PREDETERMINED MINIMUM TEMPERATURE, SAID THERMOSTATIC CONTROL MEANS OPERATIVELY CONNECTED TO SAID VARIABLE SPEED POWER MEANS SO AS TO CAUSE THE SPEED OF SAID EXHAUST FAN TO INCREASE IN PROPORTION TO THE INCREASE IN TEMPERATURE OF THE GASES IN SAID EXHAUST DUCT MEANS ABOVE SAID PREDETERMINED MINIMUM TEMPERATURE WHEREBY SAID EXHAUST FAN WILL FORCE A SUBSTANTIALLY EQUAL WEIGHT OF SAID GASES THROUGH SAID EXHAUST DUCT MEANS PER UNIT TIME REGARDLESS OF THE TEMPERATURE OF SAID GASES.