TABLE 3A
Vibration Isolator Types and Minimum Static Deflection
(MSD, inches) for 4-8 inch slab on grade and column supported.
Column
Slab on earth
31-40 feet
41-50 feet
Spacing
and 0-30 feet
Equipment
Type
MSD
Type
MSD
Type
MSD
_________
(Note (1))
(Note (1))
(Note (1))
Evaporative Condensers
blowers when springs are supported on beams.
Use deflection listed for column supported
floors with up to 30 foot column spacing
when springs are located on columns or
bearing walls
Factory
Assembled Air
Handling
Equipment
AH, AC and HV
Units
(Note (2))
Suspended
Units
Up to 5 hp
H
1.0
H
1.0
H
1.0
Over 5 hp
Up to 400 rpm
H
1.75
H
1.75
H
1.75
Over 401 rpm
H
1.0
H
1.5
H
2.5
Floor Mounted
Units
Up to 5 hp
S
1.0
S
1.0
S
1.0
Over 5 hp
Up to 400 rpm
S-R
1.75
S-R
1.75
S-R
2.5
Over 401 rpm
S-R
1.0
S-R
1.5
S-R
2.5
Centrifugal
Blowers
175 - 224 rpm
S-B
4.75
S-B
4.75
S-B
4.75
225 - 299 rpm
S-B
3.75
S-B
4.75
S-B
4.75
300 - 374 rpm
S-B
2.75
S-B
4.5
S-B
4.75
375 - 499 rpm
S-B
2.5
S-B
3.5
S-B
4.5
Over 500 rpm
S-B
1.75
S-B
2.5
S-B
3.5
Tubular
Centrifugal
and Axial Fans
(Note (2))
Suspended
H with deflection specified for
centrifugal blowers
SECTION 15070N
Page 46
Previous Page
