frozen screens

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

making it suitable for most R-404A

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

They are identical components

Lennox 99M83 Heat Exchanger 320788-702 frozen screensAs 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