Lennox 31G67 Wheel 321894-709 Optimized Combustion: Helps maintain the

Optimized Combustion: Helps maintain the proper flame characteristics and prevents over-firing or under-firing of the furnace sections

By utilizing advanced thermistor-based technology

you must calculate the total equivalent length of the vent pipe based on the appliance's input firing rate and the number of elbows used

this furnace pressure switch will prevent ignition if it detects an obstructed flue

ensuring ASHRAE 90

Lennox 31G67 Wheel 321894-709 Optimized Combustion: Helps maintain theThe Lennox 31G67 Blower Wheel is a precision engineered OEM replacement part designed for high performance air delivery in residential furnaces and light commercial air handlers. This centrifugal blower wheel features a 12 inch diameter and 9 inch width, specifically balanced to maintain system integrity and reduce mechanical stress on the blower motor. Constructed from heavy duty galvanized steel, it provides superior resistance to corrosion and