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18 _________________ ____________ i. CHAPTER 2 Graphical Symbols for Drawings 65. Volume Damper 1948 Guide Ductwork 66. Deflecting Damper 67. Deflecting Damper, Up 68. Deflecting Damper, Down 69. Adjustable Blank Off 70. Turning Vanes cki. * | TR 2Qx/2 71. Automatic Dampers 72. Canvas Connections 73. Fan and Motor With Guard 74. Intake Louvers and Screen --1' _L ----- < r --1-- - \ . Abbreviations and Symbols Graphical Symbols for Drawings 75. Heat Transfer Surface, Plan 76. Wall Radiator, Plan 77.' Wall Radiator on Ceiling, Plan 78. Unit Heater (Propeller), Plan 79. Unit Heater (Centrifugal Fan), Plan 80. Unit Ventilator, Plan Traps 81. ` Thermostatic 82. Blast Thermostatic 83. Float and Thermostatic 84. Float 85. Boiler Return Valves 86. Reducing Pressure 87. Air Line 88. . Lock and Shield 89. Diaphragm 90. Air Eliminator 91. Strainer 92. Thermometer 93. Thermostat 19 Heating and Ventilating cO x t1 l L.> 1 'i o- <f> -O- e JL