Roberts Gorden Low Intensity Unitary Heater Designed for Harsh Environments HE-40 - Manual (Page 46)

HE-S ERIES I NSTALLATION , O PERATION AND S ERVICE M ANUAL
40
8.11 Common Vertical Venting
Requirements:
• Maximum of four heaters can be commonly vented
through the roof.
• Heaters must be of the same BTU output.
• Heaters must be controlled by a common
thermostat.
• Connections to a common stack must be posi-
tioned to avoid direct opposition between streams
of combustion gases.
8.12 Outside Combustion Air Supply IMPORTANT: If the building has a slight negative