Supports both analog or two-position dampers. If the system has a building pressure sensor (BLDG-P) then the damper enables whenever its associated supply fan is proven on and modulates to control the building pressure to the set-point (BLDGP-SP), the damper closes when disabled. If there is no building pressure sensor, then the damper position resets based on the minimum outdoor airflow setpoint as determined by ASHRAE 62.1 or California Title 24.