TABLE 1B
Class II Vibration Isolator Types and Minimum Static Deflection
(MSD, inches) for basements below grade and floor slabs on earth
Equipment
Type (Note (1))
MSD
Over 5 hp
Up to 400 rpm
H
1.75
Over 401 rpm
H
1.0
Floor Mounted Units
Up to 5 hp
NP
0.25
NM
0.35
Over 5 hp
Up to 400 rpm
NM
0.35
Over 401 rpm
NM
0.35
Centrifugal Blowers
175 - 224 rpm
NM-B
0.35
225 - 299 rpm
NM-B
0.35
300 - 374 rpm
NM-B
0.35
375 - 499 rpm
NM-B
0.35
Over 500 rpm
NM-B
0.35
Tubular Centrifugal
and Axial Fans
(Note (2))
Suspended
H with deflections specified for
centrifugal blowers
Floor Mounted
Arrangements 1 & 9
NM
0.35
Utility Fans
(Note (2))
Suspended and
H with deflections specified for
centrifugal
Floor Mounted
NM
0.35
High-Pressure Fans
HR recommended for minimizing
(Over 6 Inch
undesirable thrust effects
Water-Column
Static Pressure)
and Other
Machines
Producing Thrust
(Note (2))
Internal Combustion
Engines and Engine
Driven Equip
SECTION 15070N
Page 21
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