Mounting Options; Sound And Vibration Levels; Suspended Units - Modine MDB Série Manuel D'installation Et De Maintenance

mountinG oPtions

sound and vibration levels

All mechanical equipment generates some sound and vibration
which may require attenuation. Locate the equipment away
from critical areas whenever possible. Frequently, units can be
mounted above utility areas, corridors, restrooms, and other
non-critical areas. Generally, a unit should be located within 15
feet of a primary support beam. Smaller deflections mean less
vibration and noise transmission.
Field-installed, factory-supplied vibration isolators are available
for suspended or rail/slab mounted units. Figures 4.1 through
4.2 show how suspended or rail/slab-mounted vibration
isolators should be installed. For roof curb-mounted units
(not supplied with factory-installed internal vibration isolation),
Figure 4.3 shows suggested methods of sound attenuation.
Figure 4.1 - vibration hangers (suspended units)
Figure 4.2 - vibration Feet (slab or rail mounted units)
3/8''-16x2''
BOLT
3/8''WASHER
3/8'' NUT
SIDE VIEW (110-118)
Figure 4.3 - suggested sound attenuation
2" ACOUSTIC FIBERGLASS, 3 LB DENSITY
WITHIN CURB ON TOP OF ROOF DECK
STRUCTURAL SUSPENDED
TRUSS CEILING
4
3/4" UPPER
SUSPENSION ROD
(BY OTHERS)
SELF LOCKING NUTS
OR DOUBLE NUTS
NEOPRENE ELEMENT
3/4" LOWER
SUSPENSION ROD
(BY OTHERS)
5-5/8
SIDE VIEW (120-230)
ROOF
CURB
BALANCING
DAMPER
FLExIBLE ACOUSTIC DUCT
CONNECTION LINER INSIDE
mountinG oPtions

suspended units

Combination lifting and support lugs are supplied with each
unit. Units with accessory devices, such as filter sections,
inlet dampers, etc., must have provisions for separately
supporting these accessories. Each accessory is supplied
with its own lifting and support lugs. (Refer to Figure 4.4 for
the recommended mounting method and pages 34-37 for
dimensions.)
Be sure the structure from which the unit and accessories are
hung is adequate to handle the weight, which can be found on
page 40. The unit must be level in a horizontal position.
Figure 4.4 - unit suspension
UNIT BASE
detail - unit
sizes (110-118)
7-500.10
3/4'' THREADED 3/4'' THREADED
ROD
(1) 3/4'' NUT
& LOCK
WASHER
LIFTING &
(2) 3/4'' NUTS &
SUPPORT
LOCK WASHER
detail - unit
sizes (120-130)
ROD
LUG