Rockford Chimney Supply: Oil Heating Appliance Measurements
If you’re installing a chimney liner for your residential oil furnace or boiler, this guide will help you tremendously! We’ve narrowed in on all of the measurements you’ll need to gather.

One more thing to keep in mind before you move on to the guide - this particular guide is for relining the masonry chimney to vent a residential oil burning furnace or boiler.

Notes: Rockford's smooth wall flex liner or rigid chimney liners are recommended for oil appliances. The smooth interior wall will allow up to 15% more GPH for the liner as opposed to the standard corrugated liner.
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A1: What is the GPH (Gallons Per Hour) firing rate of the appliance?
A2: What is the efficiency rating of the appliance? If you are unable to locate the efficiency rating, you can calculate the efficiency by dividing the BTU output by the BTU input.
B1: What is the lateral/horizontal distance from the appliance TO the side of the chimney?
B2: What is the diameter of the connector pipe that is connecting the appliance to the chimney?
C1: What is the depth (or thickness) of the chimney thimble?
C2: Does the current chimney have a terra-cotta clay flue inside? If so, does the flue extend above the top of the chimney?
C3: What are the exact inside measurements of the existing chimney flue?
C4: What is the height of the chimney from the thimble hole to the top of the chimney?
D1: Every installation is different and nothing is standard in the chimney world! Please provide any additional information about your setup here if needed.
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