Lennox 73M72 Extension Kit 322838-754 Once the AEGIS SGR-42-UKIT is

Once the AEGIS SGR-42-UKIT is secured

Technicians recommend inspection if the safety valve is leaking

OEM Compatibility: Specifically designed for National Comfort Products 18

and E versions

Optimized Heat Transfer: The 29-degree pitch is calibrated to move the necessary CFM to maintain head pressures within manufacturer specifications

Lennox 73M72 Extension Kit 322838-754 Once the AEGIS SGR-42-UKIT isThe Lennox 73M72 is a critical Vertical Vent Extension Kit specifically engineered to modify the venting system on compatible high efficiency furnaces and SG 150 units. When standard flue runs aren't enough to clear building obstructions or meet local code for roof terminations, this OEM replacement part provides the necessary height for proper exhaust gas routing. For a tech in the field, this kit is essential for maintaining the correct 1 4 inch per