by John Krigger
This 8.5×11 durable two-sided sheet covers combustion testing, combustion standards, gas-input measurement, troubleshooting, and worst-case draft and pressure testing. It shows where to test flue gases for different types of gas furnaces. It is intended as an easy reference for technicians who test safety and efficiency of gas furnaces. Illustrations: 3 photos, 1 line drawing, 4 tables, and two charts.
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