Kenmore 33205 Owners Manual - Page 12

Chemicvalpocrorrosiofntheflueb, lowearssembalnydvenstystem 3. When communicating with the outdoors through horizontal ducts, mayoccuifrairforcombustcion taicnesrtacinhemicvalporSs.pray each opening shall have a minimum free area of 1 square inch per canpropellanctlse,aninsgolventrse,frigeraatonrdairconditioner 2,000 Btu per hour (11 cm2/kW)) of total input rating of all equipment refrigeranstwsi,mmipnogocl hemicaclas,lciumandsodiumchloride, in the enclosure, see Figure 14. waxebs,leacahndprocescshemicaalrsetypicaclompounwdhsich arepotentiaclolyrrosive. 4. When ducts are used, they shall be of the same cross-sectional area A. ALL AIR FROM INSIDE BUILDINGS: (See Figure 10 and 11) as the free area of the openings to which they connect. The minimum The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume short side dimension of rectangular air ducts shall not be less than 3 inches (7.6 cm), see Figure 14. so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment VENTTHROUGH installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of one _ROOF "% square inch per 1,000 Btu per hour (22 cm2/kW) of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches (645 cm2). One opening shall commence within 12 inches OUTLET AIR DUCT ! VENT TO OUTDOORS (31 cm) of the top and one commencing within 12 inches (31 cm) of the bottom of the enclosures. € o I INLET A_R DUCT !, VENT THROUGH =_. _ ROOF [_ _1 OPENINGS _ _ VENT TO _UTDOORS W'ATER {_ FIGURE 14. FIGURE 11. B. ALL AIR FROM OUTDOORS: (See Figures 12, 13 and 14) The confined space shall be provided with two permanent openings, one commencing within 12 inches (31 cm) of the top and one commencing within 12 inches (31 cm) from the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors. 1. When directly communicating with the outdoors, each opening shall have a minimum free area of 1 square inch per 4,000 Btu per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure, see Figure 12. VENTILATION LOUVERS (each end of attic VENT THROUGH ROOF VENT TO OUTDOORS FIGURE 14A. 5. Alternatively a single permanent opening may be used when communicating directly with the outdoors, or with spaces that freely communicate with the outdoors. The opening shall have a minimum free area of 1 square inch per 3,000 BTU per hour (8.3 cm2/kW) of total input rating of all equipment in the enclosure. See Figure 14A. VENTILATION LOUVERS leach end of attic)_,_.. VENTILATION LOUVERS FIGURE 12. VENT THROUGH AIR OUTLET _-_It _ VENT TO lii1-4u4z.o0oo INLEkTmRDUCT-"_ _I I H_WATER lends 1" above floor) nuL_ n HEATER FIGURE 13. 6. Louvers and Grilles: In calculating free area, consideration shall be given to the blocking effect of louvers, grilles or screens protecting openings. Screens used shall not be smaller than 1/4 inch (6.4 mm) mesh. If the free area through a design of louver or grille is known, it should be used in calculating the size opening required to provide the free area specified. If the design and free area is not known, it may be assumed that wood louvers will be 20-25 percent free area and metal louvers and grilles will have 60-75 percent free area. Louvers and grilles shall be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation. 7. Special Conditions Created by Mechanical Exhausting or Fireplaces: operation of exhaust fans, ventilation systems, clothes dryers or fireplaces may create conditions requiring special attention to avoid unsatisfactory operation of installed gas utilization equipment. 2. When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure, see Figure 13. 12