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facturer or installer shall affix a prominent marking on or 1. The return-air opening into the closet, regardless of locanear the appliance where it is easily read when the tion, is to be sized not less than specified on the appli ctoset door is open. The marking shall read: ance's rating plate. If the return-air opening is located in the floor of the 2. closet (versus the vertical front or side wail), the opening _WARNING is to be provided with means to prevent its inadvertent closure by a fiat object placad over the opening. HAZARD OF ASPHYXIATION, DO NOT COVER 3. OR RESTRICT FLOOR OPENING The cross-sectional area of the return duct system (when located in the floor or ceiling of the manufactured home) AIR DISTRIBUTION SYSTEMS leading into the closet is to be not less than that of the opening specified on the appliance's rating plate. For proper air distribution, the supply duct system shall be designed so that the static pressure does not exceed the 4. The total free area of openings in the floor or ceiling reg- listed static pressure rating on the furnace rating plate. isters serving the return-air duct system is to be not less than 150% of the size of the opening specified on the Three typicaldistdbution systems are illustratedin Figure 2. appliance's rating plate. At least one such register is to Location, size and number of registers should be selected on be located where likelihood of its being covered by car- the basis of best air distribution and floor plan of the home. peting, boxes, and other objects is minimized. The Air Temperature Rise is to be adjusted to obtain a tem 5. Materials located in the return duct system have a flame perature dse within the range(s) specified on the furnace rat- spread classification of 200 or less. ing plate. A Singletrunk duct _C E TransitionDuct withBranches B* Transitionduct Dualtrunkduct withcrossoverconnector Dualtrunk duct Crossover I _r-..3 1. CrossoverDuct must becentereddirectlyunder furnace. 2. Use12"DiameterRoundorinsulatedFlex-ductonly. 3. TerminateFlex-duct(oppositefurnace)inthecenterofthetrunkduct. 4. Flex_uct matedalmustbepulledtight--NoLoopsorunnecessarydips-- AirFlowmaybeimpeded. FIGURE 2 : Air Distribution Systems Unitary Products Group 035-16328-002C(0902) Rev. Return Air Grille Part No. 7900-287P/A * White 250 SQ. IN MINIMUM FREE AREA B 250 SQ. IN. MINIMUM 50 SQ LN FREE AREA _ MINIMUM FREE AREA FIGURE 3 : Closet To Door Clearance -6" or Greater 250 SQ, IN MINIMUM t FREE AREA B 50 SQ IN. MINIMUM FREE AREA 250 SQ. IN MINIMUM FREE AREA As an option to _e lower grill, an undercut of 2-1/2" will provide 50 Square Inches of free area. FIGURE 4 : Furnace To Closet Door Clearance -1" To 6" MINIMUM FREE AREA MINIMUM _i_ 25050 SQ. SQ.SQ. IN.IN FREE AREA Furnace to Closet Door Clearance -5 Inches or more The closet door MUST have a minimum o1250 Square Inches of free area inthe upper half of the door. If opening for return air is located in the floor or sidewalls and below the top of the furnace casing: 1. 6 inches minimum clearance must be provided on side where return is located, and 2. 6 inches minimum clearance must be maintained from the Pont of furnace. J_ i5_°_r _ac/_"t Return Air Closet Door Part No. DOOR 7900-7771/C * White Furnace to Closet Door Clearance -Greater than 1 Inch and Up to 5 Inches 1. The closet door MUST have a minimum of 250 Square Inches of free area in the upper half of the door and a minimum of 50 Square Inches of free area in the lower area of the door. The lower closetdoor grille may be omitted if an undercut of 2-1/2 inches i...

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