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OPERATION humidity. The cooling effect is produced by the evapora­tion of water in the excelsior pad, therefore, pad must be large enough to cool all of the air handled by the fan. If a small pad is used, some air is drawn into the room that has not been cooled, but is simply moist. This should be avoided. All air drawn into the house passes through the excelsior pad, which acts as a filter and collects dust, insects, etc. For this reason excelsior pad should be easily removable and excelsior replaced as frequently as conditions make it necessary. It is also necessary to remove the pad for oiling fan motor approximately once a month. Water supply to the pad should be such as to distribute water evenly over the entire surface of the pad. -Continued Proper location of the fan blade in the opening is neces­sary to assure all air handled by the fan being drawn through cooler. The fan should not be spaced so air will be drawn from the room and recirculated. For home use the three speed fan is best suited, as it provides second and third speeds for use after the home is cooled or for night use or milder weather. In hot climates where applicable, experience has proven that with proper construction and operation, the evapora­tive cooler will lower temperature from 20 to 25 degrees, and these results are obtained with 50% or less relative humidity, thereby bringing both temperature and humidity within “the comfort zone.” CDetaiLs of Gomlraction TYPE A B C D E I6S. 28 21 14 ?'I 16 17 I6K 40 30 20 . '1 16 17 IQjK 48 36 24 it i9i 20Jt ALL DIMENSIONS IN INCHES Materials and Parts for Evaporative Coolers Can Be Purchased From FORM S533 70M 3-38 PRINTED IN U. S, A.