Lennox C0SNSR22AE1, Outdoor Air Weather-Head The Outdoor Air Weather-Head effectively reduces the fluctuation of outdoor static pressures caused by wind gusts. Eliminating this fluctuation is necessary in the control of building pressures which use outdoor static pressure as a reference Includes 50 ft. of vinyl tubing, weather-head, mounting bracket and hardware. Adjustable bracket for horizontal or vertical mounting. Used with C0SNSR21AE1- (78M20) Return (Building) Static Differential Pressure Sensor.