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134 CHAPTER 7 1957 Guide | has also been reported that the influenza virus loses much of its virulence when the relative humidity is 50 percent.15 Well controlled, large scale tests of the various methods of air sterilization conducted in barracks16-17 have confirmed the importance of dust control in minimizing the spread of airborne disease, a consideration which has guided the practices of ventilating engineers for a number of years.

498 ft o a R_ t j as t Q oO ^,3 Z < g5 -o*oo I |3 go gs IS H^ Bg 1 ^ft S |p 3 " :g 2 r1v* 42 ^| g =| p tS ft 5 S a 1PS$ a w a o> a*e, e** .5 a Q H H; k Haz~ ljsS5 -c2a I 2 as '3 a " O foc. lb oa .pfet.

580 CHAPTER 21 1957 Guide be raised to ensure that the pressure is always above the equivalent evapora-: tion pressure.

740.

804 CHAPTER 31 1957 Guide mately 17 in.

872 CHAPTER 34 1957 Guide"* l' , circulating water as a result of evaporation; that the water suspended in the tower is surrounded by a film of air which is saturated with water vapor and at the temperature of the water surrounded; and that the basic theory of cooling tower operation proposed by Lewis13 and developed by Merkel11 is applicable.

1034 CHAPTER 41 1957 Guide Electric Heating 1035 plaster is drying out, the range and rate of temperature changes (either increase or decrease), should be kept low.

28 1957 Guide HEATING SYSTEMS.

30 1957 Guide INSULATION.

NX / - Air System Equipment Fans and Biowm Western Blower Company Main Office and Plant: 1800 Airport Way, Seattle 4, Washington Sales Offices in the Principal Cities West of Rocky Mountains Multiblade Fans MSI Exhausters Utility Sets Turbine Multiblade Fans--forward curved blade, Type TR, or backward curved blade, Type "S," fans for heating, ventilating, mechanical draft, etc.

198 * " CHAPTER 9 >1958 Guide S a.

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