Roof Curb Mounted Units; Roof Curb Installation - Modine MDB Série Manuel D'installation Et De Maintenance

mountinG oPtions / rooF curB installation
roof curb-mounted units
An optional 14" or 24" high roof curb is available to simplify
site preparation and raise the unit above roof water and snow
levels. It can be installed with the roof, and in advance of
the unit. The curb is shipped knocked down with separate
instructions for its assembly, flashing, and sealing with the roof.
See page 38 for dimensions.
Figure 6.1 - typical roof curb details with unit
installed over areas where sound is not critical
Counterflashing
(By Others)
Roofing
Material
(By Others)
Insulation
(By Others)
Cant Strip
(By Others)
Roof Insulation
(By Others)
Roof
Truss

roof curb installation

1. The roof structure must be adequately designed to support
the live weight load of the unit and any other required
support structure. The roof curb should be supported at
points no greater than five feet apart. Additional truss
reinforcement should be provided, if necessary.
2. If the roof curb is supplied by Modine, refer to the latest
revision of literature #7-590, "Installation Instructions - Direct
Fired Roof Curb" for instructions.
3. Outside curb dimensions must be held when installing the
curb, and the top of the curb must be level to insure weather
tightness. All corners must be square.
4. All dimensions have a tolerance of +/- 1/8".
5. Final electric and gas connections must be made after the
unit is installed to allow for tolerance in setting of the unit on
the curb. For electrical power supply, allow approximately
eight feet of wire, plus provisions for weather tight flexible
conduit for connection to the unit,
as required by local codes.
6. Maintain an 8" minimum height from the top of the roof deck
to the top of the curb.
7. Accessory items, such as inlet hood, V-bank filters, and
discharge dampers must be supported separately. (Refer to
the following section for additional information.)
6
Wooden
Nailing
Strip
(Included with Curb)
Curb
(Included with Curb)
2" Acoustic
Fiberglass
(By Others)
Roof
6" Inverted
Deck
Channel
Both Sides
(By Others)
inlet accessory support
If the unit has unsupported inlet accessories such as V-bank
filters and/or inlet hood, a method of support is required as
shown in Figure 6.2.
1. If there is an inlet hood, Modine offers a factory supplied,
field installed Inlet Hood Support kit. Refer to the latest
revision of Modine Literature #7-591 for more information.
2. If there is a V-bank filter section, Modine offers a factory
supplied, field installed V-Bank Support kit. Refer to
the latest revision of Modine Literature #7-591 for more
information.
3. If there is an inlet damper, that does not require separate
support.
Figure 6.2 - inlet accessory support on roof curb
mounted units
INLET HOOD SUPPORT
(BY MODINE OR OTHERS)
7-500.10
V-BANK FILTER SUPPORT
(BY MODINE OR OTHERS)
ROOF CURB
(BY MODINE OR OTHERS)