A-A-1939B
3.2.2 Insulation. Insulation shall be Class A or B in accordance with National Electrical Manufacturers Association (NEMA) Standard No. MG-1
3.2.3 Switch. The switch shall have one off and not less than three on speed positions.
3.2.4 Power cord and Plug. The flexible cord shall be rated for use at a voltage not less than the rated voltage for the type as specified in paragraph 3.2.1 of this document. The fans shall be furnished with a three wire power supply cord with an integral ground. The power supply cord shall have a minimum overall length of eight feet. The power supply cord shall be terminated with the plug style as specified in paragraph 2.1, Table 1.
3.2.5 Base. The base shall be suitable for desk or floor use and wall mounting. The base shall be metal or plastic and provide sufficient strength to support the weight of the fan when it is wall mounted. The base shall also have sufficient weight and strength so that the fan remains stationary when operating on a desk top at the highest speed.
3.2.6 Blade assembly. The blade assembly shall consist of a complete air screw having at least three impact resistant plastic blades molded together with a hub or central support. The diameter of the blade assembly shall be as specified in paragraph 2.1 and shall have a tolerance of +/- 1/2 inch.
3.2.7 Head tilt. The tilt adjustment shall adjust to a minimum of 10 degrees above or below the horizontal plane of the motor axis for desk fans. The head tilt and locking device shall be designed to permit adjustment and locking of the tilt position within the range as specified above without the use of tools.
3.2.8 Oscillating mechanism. The oscillating mechanism shall have a cycle with a minimum angle range oscillation of 80 degrees. The mechanism shall be designed to be disengaged in any position within the oscillation cycle. The fan shall remain stationary in the position of disengagement.
3.2.9 Guard. The guard shall enclose the entire face, perimeter and reverse side of the fan blades and associated moving parts. The guard shall consist of a front section and a rear section designed so that when assembled to form a complete guard. Additionally, the sections must be readily separable, without the use of special purpose tools, so as to permit access to the blade assembly and associated moving parts.
3.2.10 Codes and standards. Fans shall conform to the applicable requirements of the codes and standards specified in 3.2.10.1 through 3.2.10.3.
3.2.10.1 NFPA. Wiring shall conform to National Fire Protection (NFPA) Standard No. 70.The National Electrical Code.
3.2.10.2 NEMA. Motors shall conform to National Electrical Manufacturers Association (NEMA) Publication No. MG-1.
3.2.10.3 UL. Fans shall conform to the requirements of Underwriters Laboratories Inc. (UL) Standard No. UL 507.
3.3 Materials. Materials not specified herein shall be of the quality specified by the manufacturer and shall conform to the manufacturer’s own drawings, specifications, standards, and quality assurance procedures.
3.3.1 Finish and color. The fans shall be finished according to the manufacturer’s standard commercial practice.
3.4 Performance. The fans shall conform to performance requirements expressed in paragraphs 3.4.1 through
3.4.3.
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