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Air Washers New York, N. Y. Boston. Mass. Philadelphia, Pa. Cleveland, O. Columbus. O. Midwest Air Filters, Inc. 100 East 45th St., NEW YORK, N. Y. BRANCHES: Indianapolis, Ind. Minneapolis, Minn. San Francisco. Cal. Kansas City, Mo. Pittsburgh. Pa. Chicago, 111. Richmond. Va. St. Louis, Mo. Denver, Colo. Detroit, Mich. Salt Lake City. Utah Milwaukee. Wis. Seattle, Wash. Dallas. Tex. Montreal, Canada Description of Unit A Midwest filter unit consists of a frame and a cell. The cells are set on the frames after the frames are put in place. Two or more frames can be bolted together in any shape to obtain the desired capacity filter. See cut on opposite page, for typical instal lation. Midwest Unit Air Filter--Type U- Dimensions of Units Each frame measures 20 x 20 x 33^ in. Each side of the frame has two bolt holes in order that the adjoining frames may be bolted together. i HOW TO DETERMINE THE NECESSARY NUMBER OF FILTER UNITS for a GIVEN QUANTITY OF AIR Each filter Unit has a normal capacity of 1000 C.F.M. Therefore divide the total quantity of air to be cleaned per minute by the capacity of ^n individual Filter Unit. Average Resistance, water gage. The following table gives the number of Filter Units necessary for the various air quantities. However, the proper number of units for any intermediate air quantities can be determined as previously described. C.F.M. 2,000 4,000 6,000 10,000 15,000 20,000 30,000 40,000 50,000 60,000 70,000 60,000 90,000 100,000 200,000 1.000,000 Number of Square Ft. Filter Unit* over Front 2 4 6 10 15 20 30 40 50 60 70 80 90 100 200 1,000 5.55 11.11 16.7 27.80 41.7 55.5 83.3 111 .1 138.9 166.7 .194.4 222,2 250.0 277.8 555.6 2,777.8 Approximate Weight Installed 130 240 340 540 780 1,010 1.470 1,950 2.400 2.850 3,560 4,010 4,410 4,720 9,400 47,000 Flexibility Being constructed on'the multiple unit principle, this filter can be assembled in any shape or design to conform to local conditions and space allowance. When units are to be assembled in any shape other than in one plane, the Midwest Air Filters, Inc., furnish suitable corner connections, enabling the filters to be in stalled in the shape which local conditions require. 184 vrasfrsssgggaL Midwest Air Filters, Inc. Air Washers Typical Installation The filter can be installed in a room or in an enlarged portion of the duct. The air may be taken from the outside of the building or it may be taken from the inside and recirculated. If inside space is valuable, the filter can be placed outside the building or on the roof, ducts lead ing from same to various points of distribution. Inlet and Outlet Ducts for small installations of about 25 units and under, should be about 3 ft. away from the filter. For large installa tions, this distance should be in creased accordingly. An air velo city of 1,000 ft. to 1,200 ft. per min. in ducts leading to and from the filter is recommended. The maintenance consists of cleaning the filter cells when they have become sufficiently dirty to materially increase their resistance, and in re-charging them with Mid west Viscosine. The cleaning is done by immersing the cells in the washing tank containing hot water or, if necessary, a solution of hot water and soda. After a cell has been cleaned, it is placed in the drying racks in order that all water may drain off. After the cell is perfectly dry, it is immersed in a bath of Viscosine, and again placed on the racks to enable the surplus Viscosine to drain off. As cell is taken out of an installation for cleaning and re-charging, a ready reserve cell is inserted in its place. The time that the cell may be in service between cleanings varies from 12 to 20 weeks under normal conditions. OTHER TYPES OF FILTER Filters for Turbo-Generators, Air Compressors, Tractors, for cleaning air and gases with heavy dust content, built to suit various industries and uses. 185