A-A-1943B
3.4.1 Operating speed. The low speed position shall provide 60 to 80 percent of the maximum speed when operating at rated voltage and frequency. The fan shall be operated at both low and maximum speed settings and speed (r.p.m.) shall be measured stroboscopically or with a counter which imposes no appreciable load on the fan motor. The sensitivity and accuracy of the test apparatus shall be such that differences of 20 r.p.m. may be detected.
3.4.2 CFM air delivery. The fan shall be mounted so that the axis is 4 feet above the floor. The plane of rotation of the fan blades shall be at least 5 feet from any wall. The anemometer shall be rigidly supported in the air stream with the axis of rotation parallel to the axis of rotation of the tan. The anemometer stand shall be located so that the center of the anemometer, in each station will be in a single vertical plane which is parallel to and 9 feet in front of the plane of rotation of the fan blades. Test readings shall be taken at 2 inch intervals over a four foot span, both vertical and horizontal lines at a distance of 9 feet in front of the plane of rotation of the fan blades. The center of the four foot span referenced above shall be on a line coincident with the axis of rotation of the fan blades. A total of 49 test readings shall be taken. Each test reading shall be taken over an operating period of not less than two minutes. All readings shall be taken at maximum fan speed. The air delivery in cubic feet per minute shall be the average of all test readings in feet per minute multiplied by the area of a 4 foot diameter circle (12.56 square feet). The minimum CFM air delivery shall be as specified in paragraph 2.1 for the type and blade diameter as specified in the contract or order.
3.4.3 Vibration limits. The rotating components of the fan shall be balanced to the extent that total vibration shall not exceed 0.009 times the distance in inches between an upward extension of a vertical line running through the approximate center of the motor support and point of measurement. The distance is to measured parallel to the motor axis with motor housing adjusted for zero degrees tilt.
3.5 Order of precedence. In the event of a conflict between the text of this CID and the referenced documents cited herein, the text of this CID shall take precedence. No reference in this CID shall supersede applicable laws and regulations unless a specific exemption has been obtained.
3.6 Data. In addition to the safety and installation instructions required by UL Standard No. 507, the contractor shall furnish with each fan a copy of the manufacturer’s standard “owner/operator manual” applicable to the machine. The manual shall include instructions for operating the machine, safety precautions, commercial repair instructions which shall include a complete list of all replaceable parts and preventative/routine maintenance instructions. This data shall be the same information that is provided with similar machines sold in the commercial market.
3.7 Metric product. Product manufactured to metric (S1) dimensions shall be considered on an equal basis with those manufactured using inch-pound units of measure provided they fall within the specified tolerances using conversion tables contained in the latest revision of ASTM E 380, Standard Practice for Use of the International System of Units (S1), and all other requirements of this Commercial Item Description are met. If a product is manufactured to metric dimensions and those dimensions exceed the tolerances specified in inch-pound units, a request should be made to the contracting officer to determine if the product is acceptable.
4. REGULATORY REQUIREMENTS
4.1 Occupational Safety. Fans shall conform to Occupational Safety and Health Act (OSHA), 29 CFR 1910.
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