MIL-DTL-151F
CEILING
MAXIMUM VELOCITY
TO BE DETERMINED
18 INCHES
WITHIN THIS SPACE.
5 FEET
FLOOR
Figure 1 Mounting.
D. c. motors.
3.5.4
Brushes. Brushes shall be rectangular in shape and shall conform to NEMA CB1 except that the brand
3.5.4.1
marking may be omitted. The sides of the brushes shall be smooth and free from saw marks.
3.5.4.2
Brush holders. Brush holders shall be readily accessible for the renewal of brush or spring. The
brush-feeding device shall insure proper brush contact under all conditions of brush and commutator wear. The brush
holder caps shall be so constructed that no live parts are exposed.
3.5.4.3
Commutator. The commutator shall be of sufficient depth to allow turning down to an extent of 0.10 inch
reduction in diameter. The insulation between commutator bars shall be undercut.
3.6 Voltage. The fans shall be designed for operation on 115 volts, single phase, 60 cycles a.c. or 115 volts d.c.
as specified (see 6.2). Fans shall operate satisfactorily in accordance with the requirements of this specification
between the limits of 105 and 125 volts.
3.7 Operating temperatures. Fans shall operate satisfactorily over an ambient temperature range from minus
18º C (0º F) to 38º C (100º F). The fans shall start and run smoothly at minimum rated voltage while in an ambient
temperature of minus 18º C after having remained idle in an ambient temperature of minus 18º C for 24 hours. The
fans shall also start and run smoothly at minimum rated voltage while in an ambient temperature of 38º C after having
remained in an ambient temperature of 38º C for 4 hours.
3.8 Input. The power input at rated voltage shall not exceed 35 watts. The power input of any individual fan shall
not vary more than 15 percent from the average obtained when samples (see 4.3.1) are tested as specified in 4.4.4.
3.9 Speed. The speed of any individual fan shall not vary more than 5 percent from the average speed obtained
when samples (see 4.3.1) are tested as specified in 4.4.3.
4
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