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CTH3-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
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8.10 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
positioned to avoid direct opposition between
streams of combustion gases.