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This screen is provided with the furnace installation instructions and functions to prevent debris from entering the combustion system. It should be installed on the combustion air intake collar or inlet PVC. If furnace location is such that this opening might be unintentionally obstructed, a 3" PVC elbow should be installed on the collar, and the screen placed inside the inlet of the elbow. See Figure 8. Installation In An Unconfined Space ! CAUTION: "Tight" buildings (with weather stripping and caulk to reduce infiltration), may require special provisions for introduction of outside air to ensure satisfactory combustion and venting, even though the furnace is located in an unconfined space. An unconfined space is an area including all rooms not separated by doors with a volume greater than 50 cubic feet per 1,000 Btuh of the combined input rates of all appliances which draw combustion air from that space. For example, a space including a water heater rated at 45,000 Btuh and a furnace rated at 75,000 Btuh requires a volume of 6,000 cubic feet [50 x (45 + 75) = 6,000] to be considered unconfined. If the space has an 8 foot ceiling, the floor area of the space must be 750 square feet (6,000 / 8 = 750). In general, a furnace installed in an unconfined space will not require outside air for combustion. ! WARNING: Furnaces installed with combustion air drawn from a heated space which includes exhaust fans, fireplaces, or other devices that may produce a negative pressure should be considered confined space installations. Installation In A Confined Space A confined space is one which does not meet the unconfined space volume requirements, and typically involves installation in a small room. All such installations must have specific provisions for introduction of combustion and ventilation air. Codes require that two openings be provided for this - one with bottom edge within 12" of the floor and one with top edge within 12" of the ceiling. The size and other criteria for these openings must be per the following sections. Combustion air openings must not be restricted in any manner. Furnaces installed in a confined space which supply circulating air to areas outside of the space must draw return air from outside the space and must have return air ducts tightly sealed to the furnace. Air From Inside Air for combustion and ventilation may be taken from inside the building through an interior wall if the building is not "tight"and if the total volume of the furnace space and the space from which air is drawn meets the volume requirements for an unconfined space. In such cases, the two openings in the wall must each have free area of at least one square inch per 1000 Btuh of total appliance input, but not less than 100 square inches of free area. See Figure 9. For example, if the combined input rate of all appliances is less than or equal to 100,000 Btuh, each opening must have a free area of at least 100 square inches. If the combined input rate of all appliances is 120,000 Btuh,eachopening must have a free area of at least 120 square inches. Air Directly Through An Exterior Wall If combustion air is provided directly through an exterior wall, the two openings must eachhave free area of at least one square inch per 4000 Btuh of totalappliance input. (See Figure 10.) Outdoor Air Through Vertical Openings or Ducts If combustion air is provided through vertical ducts or openings to attics or crawl spaces, the two openings must each have free area of at least one square inch per 4000 Btuh of total appliance input. Ducts must have cross-sectional areas at least as large as the free area of their respective openings to the furnace space. Attics or crawl spaces must communicate freely with the outdoors if they are the source of air for combustion and ventilation. (See Figures 11 and 12.) Outdoor Air Through Horizontal Openings or Ducts If combustion air is taken from outdoors through horizontal ducts, the openings must eachhave free area of at least one square inch per 2000 Btuh of total appliance input. Ducts must have cross-sectional area at least as large as the free area of their respective openings to the furnace space. (See Figure 13.) ! CAUTION: Do not supply combustion air from an attic space that is equipped with power ventilation or any other device that may produce a negative pressure. VENTING REQUIREMENTS This section specifies installation requirements for vent and "2-pipe" combustion air piping. For "one pipe" installations, install vent piping per this section and provide air for combustion and ventilation per the previous section. The capacity table provided in this section applies to the total of vent and combustion air piping for either type of installation. NORDYNE condensing furnaces are classified as "Category IV" appliances, which require special venting materials and installation procedures. Category IV appliances operate with positive vent pressure and therefore require vent systems which are thoro...

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