Always verify your specific model and serial number against the parts list to ensure the correct venturi diameter and mounting alignment

We recommend checking your manual for specific HVAC part number matching before installation

verifying the pitch and rotation of the replacement fan blade is paramount

utilizing an OEM-spec step-down transformer like the TRR1582 is the best way to prevent premature failure of sensitive electronic modules and maintain the operational integrity of the unit's safety string

Cleveland Controls DDP-109-210 Sensing Switch 321894-706 Always verify your specific modelThe Cleveland Controls DDP 109 210 is a heavy duty dual setpoint differential air pressure switch designed for critical proving and alarm functions in HVAC and energy management systems. This unit features two independently adjustable SPDT snap acting switches mounted on a single foot bracket, allowing for a precise adjustable deadband or the monitoring of two distinct pressure sources. The silicone diaphragm and rugged metallic housing ensure