Napoleon NBM030S2A Installation And Operating Instructions Manual

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W415-1117 / A / 03.11.1418IOMIOM8.1 DETERMINING COMBUSTION AIR8.1.1 CASE 1: FURNACE LOCATED IN A UNCONFINED SPACE8.1.2 CASE 2: FURNACE LOCATED IN A CONFINED SPACEH13.1Unconfined space does not necessarily mean that ventilation will not have to be introduced from the outdoors,particularly in airtight homes. The minimum requirement for unconfined space is a volume of 50 cubic feet (1.42m³) for each 1000 Btu/hr for all fuel burning appliances located within the unconfined area.If the amount of combustion and ventilation air is insufficient to properly operate the furnace and other fuelburning appliances within the unconfined area, it will be necessary to supply it from the outdoors based on thecriteria used when calculating the air supply for a confined space.NOTEIf planning to use the inside air in an unconfined space, remember to test for proper furnace operation (as wellas other fuel burning appliances located within the unconfined space) with respect to adequate combustion andventilation air with fireplace dampers open, clothes dryer running, bathroom exhaust fans on, kitchen range hoodon, etc.H13.2A confined space, (any space smaller than the minimums discussed in Case 1), must have two air openings;one within 12” (305mm) of the ceiling and the other within 12” (305mm) of the floor. The air openings mustbe sized based on whether the combustion and ventilation air is being taken from indoors or outdoors, themethod outdoor air (if used) is introduced, and taking into account any other fuel burning appliances in theconfined space.If sufficient indoor combustion and ventilation air is available for the furnace and all other fuel burningappliances, size each opening on the basis of one square inch (645mm²) of free area per 1000 Btu/hr.(Figure 4)NOTEBe sure to consider all clothes dryers, bathroom fans, range hoods, etc., when making this calculation.The minimum requirement for these openings is 100square inches (645mm²), even for the furnace modelsunder 100,000 Btu/hr.NOTEIf using grills to cover the two openings, factor in thefree area of the grill. Typically, a sidewall grill willhave a free area approximately 50% of its nominalsize. Consequently, if the required opening is 10" x10" (254mm x 254mm), it will have to be doubled ifusing a sidewall grill with 50% free area.IMPORTANT:IF AN EXHAUST FAN, FIREPLACE, CLOTHES DRYER OR ANY SIMILAR DEVICE IS PRESENT IN THEINDOOR AREA FROM WHICH THE COMBUSTION AND VENTILATION AIR WILL BE DRAWN, NEGA-TIVE PRESSURE COULD BE A PROBLEM IF NATURAL INFILTRATION FROM THE OUTDOORS DOESNOT MATCH THE RATE AT WHICH AIR IS EXHAUSTED.FIGURE 4 - COMBUSTION/DILUTION AIR FROMHEATED INSIDE SOURCES (CASE 2)