Product Description
. . . . . The F40AA Pneumatic Air Flow Switch detects air flow or the absence of air flow in ducts. The switch responds only to the velocity of air movement. It acts as an automatic operating control. The switch's control port opens on no air flow and closes on air flow.
Johnson Controls F40AA-2C Pneumatic Air Flow Switch, 175 FPM Min Flow, 3-1/8 x 6-7/8 in Paddle Size. Johnson Controls. Johnson Controls. F40AA-2C.