Lennox 33J95 Orifice 326058 758 this valve provides the consistent this valve provides the consistent throughput required to maintain a stable flame signal and prevent common ignition failure codes on the Smart System display The Belimo ZG LMSA 1 Shaft Extension is a critical hardware component designed for field technicians requiring a 3 8 inch diameter shaft extension to bridge the gap between actuators and recessed or inaccessible damper shafts they can become clogged with debris or "sooted up" due to poor primary air mixture where maintaining a balanced air to gas ratio is vital for preventing carboning and ensuring clean ignition