What is the common pressure needed from the meter to the furnace when using natural gas?

The common pressure needed from the meter to the furnace when using natural gas is typically around 7 inches of water column (WC). This pressure is essential for ensuring that the furnace operates efficiently and safely. Natural gas appliances, including furnaces, are designed to work optimally at this pressure, allowing for effective combustion and heat generation.

A pressure of 7" WC is sufficient to ensure that the gas can flow adequately through the piping system and into the furnace, where it will be mixed with air for proper combustion. Anything too low could lead to incomplete combustion, which not only reduces efficiency but can also produce harmful byproducts such as carbon monoxide. Conversely, a pressure that is too high could pose a safety hazard or damage the appliance.

Other pressures like 3" WC, 5" WC, or 10" WC may be applicable in specific contexts or for different appliances, but they do not represent the standard operating pressure for a furnace. The 7" WC standard is widely accepted and recommended by most manufacturers and industry standards for residential natural gas furnaces.