R604221-01 | Door Switch/Interlock Switch | Armstrong Furnace Amperage_3.7A This valve is constructed from

This valve is constructed from durable materials and features a compact design for easy installation

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Its precision design ensures secure locking and precise alignment

**Features:** * **Stainless Steel Construction:** Ensures corrosion resistance and longevity in harsh conditions

R604221-01 | Door Switch/Interlock Switch | Armstrong Furnace Amperage_3.7A This valve is constructed fromArmstrong Furnace Door Switch Interlock Switch (R604221 01) This Armstrong Furnace Door Switch Interlock Switch (R604221 01) is an essential component designed to ensure safety and proper operation of your furnace system. Engineered to meet rigorous standards, it acts as a vital safeguard, preventing the furnace from operating when the access door is open. Specifically engineered for Armstrong furnaces, this switch features a durable construction that