15
Rev 2.1
Provisions for combustion and ventilation air must be in accordance with Air for Combustion and Ventilation, of the latest
edition of the National Fuel Gas Code, ANSI Z223.1, in Canada the latest edition of CGA Standard B149 Installation Code
for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes. In order to protect
electrical components, the boiler room ambient air temperature shall not exceed 100 F.
The equipment room MUST be provided with properly sized openings to assure adequate combustion and ventilation air
when unit is installed with a basic Category IV venting system.
Note: All additional gas fired equipment should be considered when calculating the necessary air supply.
Direct vent
If outside air is drawn through the intake vent directly to this unit for combustion:
1. Install combustion air direct vent in accordance with drawing below. (Refer to Section 2-6 for details)
Figure 2.2. Atlas with Vertical Intake and Exhaust Venting
Figure 2.3. Atlas with Horizontal Intake and Exhaust Venting
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