Patent ID: 8100746

Claim:
A method of exchanging air in a building, the method comprising: providing a plurality of exhaust fans being at least partially disposed within the building; operatively coupling at least two controllers to each of at least two of the plurality of exhaust fans; establishing a desired volume of air to be exhausted from the building in a time period; determining a volume of air actually exhausted using at least two controllers; calculating a remaining volume of air to be exhausted in the time period using at least two controllers, wherein calculating the remaining volume of air to be exhausted in the time period includes subtracting the volume of air actually exhausted by the plurality of exhaust fans from the desired volume of air to be exhausted from the building; determining a time at which to begin exhausting the remaining volume of air using input from at least a portion of the plurality of controllers; and activating at least a portion of the plurality of exhaust fans to exhaust the remaining volume of air during the time period, based at least in part on the determined time.