Johnson Controls A 4000 158 Filter Kit Freon It features a reliable dual safety It features a reliable dual safety switch mechanism that ensures the burner only fires when the damper is in a fully open position ensuring reliability in cold start scenarios In high demand HVAC pneumatic controls this kit is specifically ported and sized for the A 4300 and A 4400 series
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Johnson Controls A-4000-158 Filter Kit Freon It features a reliable dual-safety