Armstrong World Industries 122, 243, 302 2 HW/HWC Installation and Maintenance Instructions, Units

INSTALLATION Magic-Pak: HW/HWC

6-8

Special provisions must be made concerning the location of the vent termination with relation to building air inlets. A building air inlet is consid- ered to be any door, moveable window, gravity fresh air inlet or other opening where fresh outdoor air can be brought into the building. See Table 6-2 for the clearances required.

TABLE 6-2 HW/HWC Installation and Maintenance Instructions

Units	Clearance
26, 38HW/HWC	9 Inches
51, 64HW/HWC	12 Inches

The vent system must also terminate at least 3 feet above any forced air inlet within 10 feet of it.

These clearances do not apply to the combustion air inlet of the appliance because the combustion air does not enter the air of the building.

Clearance to windows applies to openable windows and not to windows constructed only of glass with no movable parts such as picture windows.

The vent system must terminate a minimum horizontal distance of 4 feet away from public walkways, electrical meters, regulators and relief equipment.

The venting system is designed for proper operation under all weather conditions and for winds up to 40 m.p.h.

Figure 6-3 shows the required clearances of direct vent to building air inlets.

	9"
Direct Vent Terminal	12		Less than
			10'
	"	min		Direct Vent
10,000 - 50,000 Btu/hr
			'min	Terminal
			3
		12"		Forced Air Inlet
		12"	min
			Direct Vent Terminal

more than 50,000 Btu/hr

FIGURE 6-3 Required Clearances for Direct Vent Terminals

SRM-HW/HWC

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