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 cannot recommend this company to other customers. They took my money but did not complete the job. I had to hire another company - at additional cost - to complete the job.
I hired the company to repair my combi-boiler...
Our furnace blower stopped blower. Econoair responded to our service request within minutes of posting and sent a repairman the next morning, as promised. He diagnosed the problem, ordered the part and repaired in the same day. Excellent...
I recommend Econoair if you need to repair your furnace. it's super responsive; The information provided by Econoair is clear and precise. The issue has been detected and fixed within an hour.