Patent ID: 7731922

Claim:
A method of recirculating cleaned and neutralized air into a confined environment to retain a substantial portion of a thermal energy content of the air which was originally drawn from the confined environment as part of an exhaust flow which contains gaseous carbon monoxide contaminants and particulate contaminants, the method comprising: establishing the exhaust flow of the air and contaminants from within the confined environment, the air of the exhaust flow having the thermal energy content; liquid scrubbing the particulate contaminants from the exhaust flow; moving the flow in a curved path to force liquid mist introduced into the flow by the liquid scrubbing to coalesce into liquid by centrifugal force caused by moving the flow in the curved path; removing the coalesced liquid from the flow; removing odor from the flow after the coalesced liquid has been removed; catalytically converting the carbon monoxide gaseous contaminants in the flow into benign carbon dioxide gaseous constituents after the coalesced liquid has been removed; retaining a substantial portion of the thermal energy content of the air withdrawn from the confined environment while liquid scrubbing the contaminants, coalescing the liquid mist, removing the liquid, removing the odor and catalytically converting the carbon monoxide gaseous contaminants into benign carbon dioxide gaseous constituents; and discharging the flow with the retained thermal energy content back into the confined environment after the particulate contaminants have been removed, odor has been removed and the carbon monoxide gaseous contaminants have been catalytically converted into the benign carbon dioxide gaseous constituents.