provided they are in good working order

this specific 35-70 Series control is a "NoPP" (No Pre-Purge) model

a critical factor for contractors integrating devices into complex BAS (Building Automation Systems)

cross-referencing over a dozen specialized part numbers including Robertshaw 41-402 and Norton 201 series

Johnson Controls D-3153-1 Damper Actuator Els PW 17895 provided they are in goodThe Johnson Controls D 3153 1 is a heavy duty pneumatic piston damper actuator engineered for precise control of large ventilation dampers and safety applications. This unit features a rugged die cast aluminum body and a high performance 15 square inch synthetic elastomer diaphragm, providing the force necessary to drive dampers up to 25 square feet in two position applications or 16 square feet for proportional volume control. With an 8 13 psi spring