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common in 42-frame configurations
preventing the nuisance lockouts commonly caused by poorly seated or cracked furnace pressure tubing
leak-tight seal in hot water and steam systems
This negative pressure switch is factory-calibrated to a precise set point of -
featuring a 30-second pre-purge to clear the combustion chamber and a 7-second trial for ignition (TFI) to ensure reliable burner start-up
Aprilaire 4973 Steam Hose 319852-301 common in 42-frame configurationsThe Aprilaire 4973 Steam Hose is a critical component for maintaining your whole home humidification system. This high quality 6ft steam hose is specifically engineered for use with the Aprilaire Model 800 Humidifier and Model 801 Steam Humidifiers. Featuring a durable 3 4 inch inner diameter (ID), it facilitates the seamless delivery of moisture from the steam canister to the dispersion tube, ensuring optimal indoor air quality. This complete kit
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