The Packard 48331 is a single-speed inducer assembly, a crucial component found in specific gas furnaces and some high-efficiency oil furnaces. An inducer assembly is essentially a small fan, typically located near the flue pipe of the furnace. Its primary function is to create a negative pressure zone. This negative pressure zone helps draw combustion gases out of the furnace and safely vent them up the flue pipe. Proper venting of these gases is essential for safe and efficient furnace operation, preventing them from accumulating inside your home. 

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