The third series of numbers is the Manufacture date- this tank was manufactured on the 80th day of 2007, so the first digit signifies the year and the next three signify the day of the year -Ģ)If order is like: 253000-08065-00040-77470007254 The second sequence is the year and day of the year the product was manufactured so-65th day of 2008. Broan: (since 2005) 4th and 5th digits in S# = year (S# will start with letter).Bard: ( June 1980 to Current) 5th & 6th digits in S# = Year.Pre 1974 it was the first two numbers in the S# can call 800 448-5872 or 97 (most are stamped on â€“ See Lennox) Arco-aire: A letter followed by two #â€™s in the S# = year ex: R883512345 = 1988.O = 80, T = 81, U = 82Ĥ) If S# is number letter-4 numbers (1971-1979) In 70â€™s there was a number for year followed by letter for month ex 1C-xxxx = March 1971, etc.

American Standard (date on plate since 1987)ġ) If S# is 9 numbers than (2002-present), the first digit of the serial number is the year followed by the week.Ģ) If S# starts with a letter (1983-2001) a letter was used in the first position to designate the year followed by the week.ģ) If S # is 6 numbers than a letter (1980-1982), 1980, 1981, 1982 the year is a letter in the 7th place.Airquest A letter followed by two #â€™s in S# are year.AirTemp 5th digit in S# = year (Only manufactured in 1977-1978).Amana (1971-1995 Now owned by Goodman) uses (1st letter) â€œB L A C K H O R S Eâ€ code prior to being owned by Goodman.

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