O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
Humidity in House Heating
Humidity in House Heating: The Cause And Control of Air Dryness In House Heating is a circa-1929 booklet from the Dominion Fuel Board and the Natural Resources Intelligence Service Department of the Interior in Canada.
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