Gas piping comes in a variety of materials, but the most common one in households is black steel. The length of the gas pipes may also affect gas flow - the longer the pipe, the lower the air flow. When in doubt, hire a home service pro to get the job done.
Empower did a good job from initial meeting through installation. Stan, the salesman, went out of his way to solve a tricky install and is a real assert to the company. Installers were professional and knew their...