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NEWS
Final Report on Research Project 8014 Released
April 26, 2017

The Air Conditioning, Heating, and Refrigeration Institute (AHRI) has recently released a final report on Research Project 8014, “Effects of Low Return Air Temperature on Gas Fired Forced Air Furnaces.” The objective of the project was to investigate the effect of low return air temperatures on the integrity of furnace heat exchangers. Five production furnaces were tested to 100 days of cycling time, or 12,000 cycles, in accordance with section 2.15 Corrosion Resistance of ANSI Z21.47-2012, CSA 2.3, Standard for Gas-fired Central Furnaces. The only difference was that the return air temperature and combustion air temperature were maintained at 45 degrees Fahrenheit ± 5 degrees Fahrenheit, with most of the time spent at 45 degrees Fahrenheit ± 2 degrees Fahrenheit and a period average of 46.1 degrees Fahrenheit. The test results indicate that low return air temperatures should be avoided if using a non-condensing furnace as that operation will cause more rapid deterioration of the furnace than with operation at normal comfort levels of ambient air (65 to 75 degrees Fahrenheit).


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