EQUIPMENT
ON GRADE
20FT FLOOR SPAN
30FT FLOOR SPAN
40FT FLOOR SPAN
50FT FLOOR SPAN
BASE
ISOL
MIN
BASE
ISOL
MIN
BASE
ISOL
MIN
BASE
ISOL
MIN
BASE
ISOL
MIN
TYPE
TYPE
DEFL
TYPE
TYPE
DEFL
TYPE
TYPE
DEFL
TYPE
TYPE
DEFL
TYPE
TYPE
DEFL
IN-LINE CENTRIFUGAL AND VANE AXIAL FANS, FLOOR MOUNTED: (APR 9)
UP THRU 50 HP:
UP TO 300 RPM
---
D
---
R
S
2.5
R
S
2.5
R
S
2.5
R
S
3.5
301 - 500 RPM
---
D
---
R
S
1.7
R
S
1.7
R
S
2.5
R
S
2.5
501 - & OVER
---
D
---
---
S
1.0
---
S
1.0
R
S
1.7
R
S
2.5
60 HP AND OVER:
301 - 500 RPM
R
S
1.0
R
S
1.7
R
S
1.7
R
S
2.5
R
S
3.5
501 RPM & OVER
R
S
1.0
R
S
1.7
R
S
1.7
R
S
1.7
R
S
2.5
NOTES:
1. Refer to specification Section 15200 for isolators and symbols. Edit to suit where isolator, other than
those shown, are used, such as for seismic restraints and position limit stops.
2. For suspended floors lighter than 100 mm (4 inch) thick concrete, select deflection requirements from
next higher span.
3. For separate chiller building on grade, pump isolators may be omitted.
4. Direct bolt fire pumps to concrete base. Provide pads (D) for domestic water booster pump package.
5. For projects in seismic areas, use only SS & DS type isolators and snubbers.
6. Isolators not required where cooling tower is located on grade or on roof over mechanical room.
7. Floor mounted (APR 1): use "B" type in lieu of "R" type base.
8. Suspended: use "H" isolators of same deflection as floor mounted.
5-7
HVAC DESIGN MANUAL
SUPPORT DATA
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