Specialised slide chart for axial ventilator characteristics - aids selection of suitable ventilator by presenting data conveniently in box windows

摘要

The slide chart contains information on axial ventilator characteristics such as pressure drop achieved, axial speed, noise level and other data, which are presented in the form of figures in windows in a simple slide rule. The data is presented is significantly easier to use than the same data presented as a catalogue. The flat plate slide (3) carries an array of data which is slid to and fro as required inside a flat box (1, 2) so that the relevant corresp. data appear in an array of small windows (8a, 8b, 8c, 8d) in the box. Axial velocity, pressure drop, volume flow and so on are thus easily obtainable for any particular case. Useful diagrams are printed on the spare surface area of the outer box (1, 2).