Patent ID: 7632178

Claim:
The method of retrofitting an existing ventilation system in a building, said method comprising the steps of: providing the existing ventilation system without an air quality sensor, having fans for exhausting stale air and bringing in fresh air, and having at least one remote switch terminal for setting a high speed mode of operation of said fans adding a relay to said existing ventilation system; inserting in a specific location at least one air quality sensor; connecting contacts of said relay to said remote switch terminals such that said relay is capable of setting continuous high speed modes of operation of said fans of said existing ventilation system; and, connecting said at least one air quality sensor in a parallel network to said relay so that when said at least one air quality sensor detects an abnormal air quality condition of air within said building, said relay is activated to set high speed operation of said fans regardless of a mode of operation at a time when the at least one air quality sensor detects a contamination indicative of the abnormal air quality condition.