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The Johnson Controls A19AAB-4 is a professional-grade mechanical temperature control designed for heavy-duty HVACR applications requiring high-precision single-stage temperature control
ensuring drop-in replacement without field modifications
For contractors performing furnace maintenance or troubleshooting no-heat calls
Extended Reach: The 24-inch length provides the necessary clearance for larger burner boxes found in high-capacity Reznor units
Lennox 64L81 Air Flapper 30067439-890 The Johnson Controls A19AAB-4 isThe Lennox 64L81 Air Flapper Kit (LB 98453B) represents a critical component for maintaining the combustion integrity of legacy Lennox Pulse series furnaces. This genuine OEM replacement kit, containing 10 individual 3 5 8" OD diaphragms, is engineered to handle the unique pressure dynamics of Lennox G14 and G21 units. As a veteran grade air diaphragm kit, these flappers regulate airflow within the combustion chamber, opening and closing in rapid
