Gas Furnace Safety. Gas furnaces are known for their safety, performance and longevity. This is largely due. to their certification to nationally recognized. safety standards and the building standards and. codes that require equipment be installed. according to the manufacturersâ installation. instructions. Despite the excellent safety record of gas. furnaces, there have been infrequent reports of. gas furnace heat exchanger problems. To address these situations, an industry-accepted procedure known as the âThree-Step Method for Detecting Unacceptable Flue Gas Leakage from Furnace Heat Exchangersâ has been used since the early 1980's to conduct field inspections of gas-fired furnace heat exchangers. Though this procedure has been effective for testing heat exchangers in natural draft furnaces, its effectiveness for testing heat exchangers on induced-draft furnaces that maintain a significant negative pressure within the heat exchanger has been questioned. Though it is unlikely for an induced-draft furnace to leak flue products from the heat exchanger to the circulated airstream, a new test procedure has been developed that enhances the existing three-step methodology to make it more applicable, reliable and repeatable for the inspection of induced-draft furnace heat exchangers. Five-Step Method1 Step 1: Look for Flame Disturbances â¢ Start the furnace and observe any changes
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jar definition, meaning, what is jar: a glass or clay container with a wide opening at the top and sometimes a fitted lidâ¦. Learn more.