1981 (8) TMI 224

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..... Secretaries]. - Government of India have considered the points raised in the revision application, those urged during the course of personal hearing and have examined tbe records of the case, 2. The facts of the case are that the applicants produced multi-stage blowers which were classified by the lower authority as industrial fans within the meaning of Tariff Item No. 33(2) of the Centr....

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....actured by their collaboration the S.S.I. was sometimes as high as 20. He drew attention to I.S.I. Specification No. IS-5972-1970 (Item No. 235), according to which "multi-stage blower" was defined es 'A Combination of rotors and stators designed to produce pressure differential requiring vacuum from 50 to 500 mm of mercury, depending upon the number of stages. Delivery of air is free from pulsati....

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.... gas/air. This comprises a variety of machines known to the trade under several names, such as fans, blowers, compressors etc. In all of them, gas or air is compressed and moved by dynamic action of the rotating vanes of one or several impellers which impart velocity and pressure to the flowing gas or air. The division between these classes of machines is drawn rather arbitrarily on the basis of d....

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....ntially atmospheric pressure. If a blower is used to raise the pressure in a system i.e., already above atmospheric pressure, it may be called a 'booster'. Every blower consists of two essential parts i.e., impeller which forces the gas/air into rotary motion by impelling action of the vanes and the easing which directs the gas/air to the impeller and leads it away at a higher pressure. Both the c....