The garage exhaust fan runs continuously during working hours, even when there are no vehicles in the bays. Conditioned air is exhausted needlessly during those times.
It is recommended that a vehicle runover hose be installed securely on the floor across the doors, to activate the exhaust fan only as needed. Each time a vehicle crosses the doorway, the fan will start and will continue running for a predetermined period. The time period should be set initially to 10 minutes, but can be adjusted as needed.