# Janitrol Furnace Age

**URL:** <https://forum.nachi.org/t/janitrol-furnace-age/52898>\
**Category:** Inspecting HVAC Systems\
**Created:** [September 28, 2010, 3:51pm UTC](https://forum.nachi.org/t/janitrol-furnace-age/52898 "2010-09-28T15:51:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jveivia](https://avatars.discourse-cdn.com/v4/letter/j/f05b48/32.png) [@jveivia](https://forum.nachi.org/u/jveivia)\
**Post date:** [September 28, 2010, 3:51pm UTC](https://forum.nachi.org/t/janitrol-furnace-age/52898/1 "2010-09-28T15:51:47Z")

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Hey,  
Got a Janitrol forced air gas furnace Model 20-100 Serial number 4563 1 and can’t find any indication of age. Anyone with a Prestons Guide that can look it up for me? I’d be very appreciative.  
John V

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**Author:** ![jbushart](https://avatars.discourse-cdn.com/v4/letter/j/919ad9/32.png) [@jbushart](https://forum.nachi.org/u/jbushart)\
**Post date:** [September 28, 2010, 4:48pm UTC](https://forum.nachi.org/t/janitrol-furnace-age/52898/2 "2010-09-28T16:48:10Z")

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That model was manufactured from 1965 through 1970.