You must align the flat portion of the motor shaft with the internal set screw of the 1/2" bore

The Rheem-Ruud 51-23012-31 Motor is a high-performance 1/2 HP replacement blower motor designed for direct-drive applications in HVAC furnace systems

Includes pre-drilled mounting patterns to reduce installation time for commercial HVAC contractors

While it is generally plug-and-play for supported models

offering significantly improved timing accuracy and robust flame sensing capabilities

BROAN-NuTone MD8TU Damper 320720-756 You must align the flatThe BROAN NuTone MD8TU is an 8 inch universal automatic make up air damper designed to provide synchronized ventilation in high performance residential kitchen environments. Engineered to meet IRC makeup air requirements, this pressure sensing damper automatically opens when the range hood is activated, preventing negative air pressure and potential backdrafting of combustion appliances. The unit features a normally closed motorized damper