Vacuum Switch - Harman NBK-20168

Vacuum Switch Ensure safe airflow monitoring and reliable appliance operation with this replacement vacuum switch, equivalent to multiple Harman OEM part numbers. Designed for compatible pellet and hearth heating systems, this switch verifies proper draft conditions to support safe ignition and continued operation. Key Features Equivalent to Harman OEM vacuum switch replacements Supports airflow and draft safety verification Helps maintain safe startup and appliance performance Direct-fit replacement for listed Harman part numbers Specifications OEM: Harman Replaces OEM: 3-20-6866 Equivalent To: 3-20-6866, 3-20-9301, 3-20-3433 UPC: Not available SKU: 20168 Category: Hearth Parts (Switch) Direct Replacement For HARMAN 559997 HARMAN 1813875 HARMAN 2703240 Why Choose This Replacement A malfunctioning vacuum switch can prevent ignition or cause unexpected shutdowns as a safety measure. This OEM-equivalent replacement helps restore accurate draft sensing and supports safe, dependable performance in Harman hearth appliances. Installation Tips Disconnect electrical power before servicing hearth appliance components. Confirm compatibility with your Harman model and part number references. Inspect vacuum tubing for cracks, blockages, or loose fittings during replacement. Ensure airtight hose connections to prevent false pressure readings. Test appliance startup cycle to verify proper switch operation. Pairs Well With Harman combustion blowers, pellet stove vacuum tubing, hearth control boards, airflow safety switch components Special Order Notice: This item requires an additional 2–3 business days to process before shipping.