Document oeZD36eKvXyLY6Daa8e17EyYo

380 CHAPTER 14 1958 Guide tightness of building construction, and the operation of exhaust fans or other devices which affect the static pressure in a building. Because of the number of variables involved in establishing air require ments, and the variations in building construction and arrangement, there is no universally accepted rule for providing ventilating, openings. How ever the importance of providing proper ventilation should not be under estimated, and a failure to do so may result in erratic or,even dangerous operating conditions for equipment. Rules for providing air supply openings are found in technical stand ards24 25, in state and municipal building codes, and in service and installa- Fig. 7. Illustration Showino Air Openings Necessary to Supply Air for Combustion When Appliance is Installed in Confined Space A. Ventilating air outlet register for furnace room, 1 sq in. free area for each 1000 Btu per hr furnace input located above relief opening of draft hood. Register must not be blocked by drapes or other furnishings. B. Both registers must either face same large ventilated interior space or extend to such space by means of ducts. Vertical distance C/L to C/L of registers should be not 1*^ than 3H ft. C. Suggest room access door be not less than 6 ft high by a width sufficient to provide for installation or removal of furnace. At least 2 ft horizontal clearance should be provided in front of furnace when closet door is open, or 18 in. when door is closed. D. Combustion and ventilation air inlet register for furnace room, 1 sq in. free area for each 1000 Btu per hr furnace input, located at or below combustion air inlet-to furnace. Register must not be blocked by drapes or other furnishings. E. Air circulated by furnace must be handled by ducts which are sealed to furnace casing and are entirely separate from means provided for supplying combustion and ventilation air. F. Spacing between draft hood and wallat least 6 in. (unless approved for closer spacing). If flue products may be directed toward wall, 12 in. spacing recommended. G. No part of furnace casing closer than 6 in. to wall (unless approved for closer spacing). H. Flue should terminate above peak of roof and above nearby walls to assure satisfactory flue perform ance. tion bulletins published by various manufacturers of fuel burning appli ances. Table 11 is a compilation of reasonably consistent data taken from a number of these sources, and should be used only as an aid to independent judgment for any particular installation. Ventilating air requirements are particularly critical for residential type appliances in closely confined rooms. Fig. 7 illustrates minimum require ments for this type of installation. REFERENCES 1 Five Hundred Tests of Various Coals in Househeating Boilers (17. S. Bureau of Mines Bulletin No. 276). 2 Combustion Efficiencies as Related to Performance of Domestic Heating Plants, by A. P. Kratz, S. Konzo and D. W. Thompson ( University of Illinois, Engineering Experiment Station Circular No. 44)- Fuels and Combustion 381 ' Quality of Anthracite as Prepared at Breakers, 1935 (U. Si Bureau of Mines Re port of Investigation, R. I. 3283). Hand Firing Soft Coal Under Power Plant Boilers (17. S. Bureau of Mines Tech nical Paper No. 80). i Combustion Flames and Explosions of Gases. Lewis and von Elbe (Cambridge University Press, 1938). Oil Burning, by H. A. Romp (Martinus Nijhoff, 1937). T ASTM Test Designation D287-39. 8 ASTM Test Designation D611-43T. 8 Tomorrow's Fuel Oil, by W. A. Sullivan and E. B. Glendenning (Fueloil and Oil Heat, Vol. 4, No. 1, May, 1945, p. 36). 10 The Correlation of Cetane Number with Other Physical Properties of Diesel Fuels (Journal of the Institute of Petroleum, Vol. 30, 1944, p. 193-197). 11 Characterization of Petroleum Fractions, by K. M. Watson, E. F. Nelson and G. B. Murphy (Industrial and Engineering Chemistry, Vol. 27,' Dec. 1935, p. 1464). 11 Burning Index for Distillates, by J. C. Reid and A. B. Hersberger. Fueloil and Oil Heat, Vol. 5, No. 9, Jan. 1947, p. 90). 18 Carbon Hydrogen Ratio of Catalytically Cracked Distillate Fuel Oils, by S. PCauley and E. B. Delgass (The Oil and Gas Journal, Vol. 45, No. 12 July 27, 1946, p. 166). 14 Rating of Fuel Oils by a Test Unit, by D. W. Locklin and G. V Parmelee (ASHVE Transactions, Vol. 57,1951, p. 139). 18 Gaseous Fuels (American Gas Association, 1948, p. 32). 18 Gas Analysis and Testing of Gaseous Materials by V. J. Altieri (American Gas Association, First Ed. 1945). 17 Tentative Methods of Test for Specific Gravity of Gaseous Fuels (American Society for Testing Materials, ASTM Designation: 1070-49). 18 Standard Method of Test for Calorific Value of Gaseous Fuels by the WaterFlow Calorimeter (American Society for Testing Materials, ASTM Designation: 900-48). 18 Domestic Gas Range Research (American Gas Association Laboratories Bulletin 7, p. 64). 78 Condensation of Moisture in Flues, by William R. Morgan (University of Illi nois, Engineering Experiment Station Circular No. 22). 71 Effect of Soot on Heat Transmission in Boilers (17. S. Bureau of Mines Report of Investigation No. 3272). 75 Effect of Soot on the Rating of an Oil-Fired Heating Boiler (National Bureau of Standards Report BMS 54). 78 Removal of Soot from Furnaces and Flues by the Use of Salts and Compounds, by P. Nicholls and C. W. Staples (17. S. Bureau of Mines Bulletin No. 360). 74 American Standard for Installation of Gas Piping and Gas Appliances in Build ings. ASA Z 21.30 1954 (American Gas Association). 78 NBFU Standard for the Installation of Oil Burning Equipments--NBFU Pam phlet no. 31 (National Board of Fire Underwriters). BIBLIOGRAPHY Fuels and Their Combustion, by Haslam and Russell (McGraw-Hill Co., 1926). Principles of Combustion in the Steam Boiler Furnace, by Arthur D. Pratt (Bab cock and Wilcox Co.). Smoke-Producing Tendencies in Coals of Various Ranks, by H. J. Rose and F. P. Liasseter (A.S.H.V.E. Transactions, Vol. 45, 1939, p. 329). Fundamentals of Combustion in Small Stokers, by C. A. Barnes (Bituminous Coal research, Inc., Technical Report No. IV). J piri^'7r211S of Bituminous Coal in the Home, by A. P. Kratz, J. R. Fellows, and v^. Miles (Illinois Engineering Experiment Station Circular No. 46). Classification and Selection of Illinois Coals, by G. H. Cady (Illinois Stale Geo logical Survey Bulletin No. 62). Bituminous Coal Research, Inc.: Technical Report VI, The Treatment of Coal with Oil and Other Petroleum Prod ucts, by J. af. Pilcher and R. A. Sherman.