While the nominal size is 20"x26"x5"

This Apollo 10-600 series valve features a top-guided design and a high-surface-area discharge path to maximize flow rates during critical overpressure events

Technicians should use a manometer to measure the overfire draft and adjust the internal damper or motor speed controls to meet the appliance manufacturer’s specified draft requirements

This valve requires a bipolar stepper motor driver or a compatible Copeland EC3 series controller to convert the 24VDC signal into the precise pulse steps required for operation

minimizing labor time and ensuring a secure connection to the air handler control board

Carrier KR51BE812 Blower Pulley 320788-704 While the nominal size isThe Carrier KR51BE812 Blower Pulley is a precision engineered OEM replacement part designed for high demand industrial and commercial air handling applications. Constructed from heavy duty steel, this fixed bore pulley is built to maintain exact belt to pulley contact, ensuring efficient torque transfer from the blower motor to the fan assembly. Its robust material composition minimizes vibration and operational noise, making it a critical component