TABLE 3B
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
or Heat Pumps
500 to 750 rpm
SV
1.0
751 rpm and up
SV
1.0
Packaged Boilers
NP
0.25
NM
0.35
Pumps
Closed Coupled
NP
0.25
Up to 7 1/2 hp
NM
0.35
Over 7 1/2 hp
S-I
1.0
Base Mounted
Up to 20 hp
S-I
1.0
20 to 75 hp
S-I
1.0
Over 75 hp
S-I
1.0
Cooling Towers and
NP
0.25
Evaporative Condensers
NM
0.35
Factory Assembled Air
AC and HV Units
(Note (2))
Suspended Units
Up to 5 hp
H
1.0
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
SECTION 15070N
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