Overview Reviews Product Description Functional Devices - AHU Fan Safety Alarm and General Purpose Logic Circuit, 24 Vac/dc Power Input, 2 Alarm Inputs all with N/O Outputs, 2.75" Track Mount Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Functional Devices Functional Devices RIBMNLB-2NO Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments