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.
I would like to express my sincere gratitude for Cathy's exceptional and thoughtful service. I had my AC failed and explained to Cathy that i have a real challenge with poor air quality having asthma and in-spite of their...