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The Dinosaur Electronics 12VDC TDR time delay relay is a replacement component for older RV propane furnaces equipped with a standard 12 V DC ignitor board. It delays power to the blower motor by 4 seconds and keeps the fan running for a 2-minute cooldown period after the heating cycle ends. Its microcontrolled design helps manage fan operation. This relay operates on 12 V DC and does not include a wiring harness. Verify furnace compatibility before installation.