The Lennox 31W19 Flue Transition is a critical induced draft component engineered for high-performance Lennox packaged HVAC systems

Rugged Construction: Built with industrial-grade materials to withstand high-cycle thermal stress and harsh furnace environments

Thermal Protection: Equipped with an internal fan to manage heat dissipation during heavy-load cycles

Adjustable heating and cooling limits protect equipment from extreme setpoint demands

Calibrated Suction Control: Maintains precise superheat to maximize heat transfer efficiency and component lifespan

Siemens Building Technology GBB161.1U Actuator 321142-301 The Lennox 31W19 Flue TransitionThe Siemens Building Technology GBB161. 1U Actuator is a heavy duty, direct coupled solution engineered for demand driven regulating in large scale HVAC systems. This modulating non spring return (NSR) actuator delivers a high 221 lb in (25 Nm) torque, making it suitable for managing supply air, return air, and face and bypass dampers in both VAV and CV installations. Operating on a 24VAC standard power supply, it responds to a precise 0 10VDC control