With a fast 20-second fail-safe spring return and a 45-second nominal drive time

Durability: Features sealed ball bearings and high-grade insulation to handle technical demands of continuous runtime

Technical Precision: Pre-calibrated 3

this specific model is calibrated for natural gas (NG) at 3

35 PSI Maximum Vessel Pressure: Rated specifically for low-pressure hydronic and steam heating systems

Lennox 99M83 Heat Exchanger 320788-702 With a fast 20-second fail-safeAs a seasoned technician, you know that a compromised heat exchanger is a non negotiable repair. The Lennox 99M83 Heat Exchanger is a genuine OEM replacement part specifically engineered for high performance Lennox gas furnaces. This assembly is a tubular heat exchanger design, which is critical for maximizing thermal transfer from combustion gases to the circulating air stream while maintaining a robust pressure seal to prevent flue gas leakage. Also