Engineering Data 160021401 North Plano Road, Richardson, Texas 75081Phone: 972-234-3202Fax: 972-497-0468AMCA Standards On Fan Arrangements, Rotation, Discharge & Motor PositionDrive ArrangementsAMCA Standards 99-2404-03, 99-2410-03 (see pages 2,3 and 7). These pages illustrate the usual fanarrangements with their proper numbers. When orderingfans, or when requesting data or prices, the required fanarrangement MUSTalways be indicated.Inlet Box Positions For Centrifugal FansStandard 99-2405-03 (see page 4 and 8). This pageshows proper designations for inlet box positions, indegrees. When ordering fans with inlet boxes thisinformation is required.Designations For Rotation & Discharge Of Centrifugal FansAMCA Standard 99-2406-03 (see page 5). Properterminology is clearly indicated on this page. Whenordering equipment, or when requesting certified prints,always be sure to include this information. No order willbegin fabrication without it, if in doubt as to properdesignation, draw a sketch. In the event that an angulardischarge is required that is NOTat 45º, be sure toclearly state what is required, such as “top angular down30º from horizontal” or “bottom angular up 20º fromhorizontal.” Here again, draw a sketch if in doubt.Motor Positions For Belt Drive Centrifugal FansAMCA Standard 99-2407-03 (see page 6). This pageindicates standard nomenclature for properly locating themotor in reference to the drive side of the fan. It is fullyaccepted by the industry and vibration basemanufacturers as well. If a bare fan without motor or driveis ordered this information is not needed; but whenever adrive or vibration base is to be included this informationis absolutely necessary. Please note that motor positionis always determined fro...
