this specific part number is designed for the 9-inch top ports

this single-speed unit is a standard replacement for many OEM blower motors and exhaust fans

Key Benefits Precise Fitment: Designed with a standard 1/2" NPT mounting for seamless integration into industrial burner systems

Its robust design is internally protected and rated for 50/60 Hz operation

Resideo YTH8321R1002 Thermostat 318973-401 this specific part number isThe Resideo YTH8321R1002 VisionPRO 8000 is a high performance, 7 day digital programmable thermostat designed for professional HVAC installations requiring precise multi stage control. Operating on 18 30 Vac or a 750 mV millivolt signal, this RedLINK thermostat is engineered for maximum versatility. In a standalone configuration, it supports up to 3 Heat 2 Cool heat pump systems or 2 Heat 2 Cool conventional systems. When integrated with an Equipment