What is the typicalgas manifold pressure for a natural gas furnace?

The typical gas manifold pressure for a natural gas furnace is between 3.5 and 7 inches of water column (w.c.). The specific manifold pressure required will depend on the model of furnace and the size of the gas line supplying the furnace. It is important to refer to the manufacturer's instructions to determine the correct manifold pressure for your specific furnace.