Product Description
. . . . . Johnson Controls F40AA-1C Pneumatic Air Flow Switch, 300 FPM Switch, 2-1/8 x 6-7/8 in Paddle Size - 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. Johnson Controls. F40AA-1C.