Gas Heating Appliance Chimney Liner Measurements Guide

Measurement Guide: Gas Heating Appliance Chimney Liner

If you’re installing a chimney liner for a gas burning appliance such as a water heater, furnace, or boiler, this guide will help you tremendously! We’ve narrowed in on all of the measurements you’ll need to gather. With these measurements, you can put together a parts list on our website or send the measurements off to us and one of our Certified Technicians will send you a parts list! Just follow the guide below and let us know if you have any questions along the way - we’re here to help.

One more thing to keep in mind before you move on to the guide - this particular guide is for a residential gas heating appliance such as a water heater, furnace, or boiler masonry chimney liner installation. Like the picture to the left. If you are looking for a different installation setup, please visit our Measuring Guide page and choose the correct setup.

Choose between sending a form directly to us online OR print off a hard copy and send it over via email, scan, or fax.

Once we receive your form, we will reply with a parts list based on the provided measurements! We're here to make things easier for you during your ordering process.

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Our 316Ti flexible chimney liner and chimney liner components have passed the rigorous testing at the Underwriters Laboratories with best in class status and are UL Listed. So if you are looking for UL listed chimney liner sold directly to homeowners, then look no further than Rockford Chimney

Customer Testimonials

Back in July you gave me excellent advice re. sizing/purchasing a flue liner for the chimney associated with my wood stove. I'd like to thank you once agai... More

—AE Northfield, MN

A few weeks ago I ordered a chimney liner system for my fireplace insert. Your salesman recommended the liner system plus the insulating blanket. I just wa... More

—AH Happy customer

Just got around to installing my new smooth flexible liner and deluxe terra cotta cap (wow). The quality of your product is second to none. Very pleased an... More

—B.B. from Massachusetts

Thanks so much for the great tech service from Dennis, very knowledgable, friendly and proffessional.Your website is the best, beats your competition by fa... More

—Bill in Knoxville

Sue and Dennis, I received the final part of my order yesterday (the chimney cap that actually fits over the chimney chase). It looks wonderful! My fiancé... More

—CC, VA

Hello, I was shopping for an fireplace insert and called RCS to ask why they were so much cheaper than my local guy, the reply was " we sell thousand of th... More

—Chris, PA.