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• Sufficient structural support must be determined prior
to locating and mounting the curb and package unit.
• Ductwork must be constructed using industry
guidelines. The duct work must be placed into the
roof curb before mounting the package unit. Our full
perimeter curbs include duct connection frames to be
assembled with the curb. Cantilevered type curbs
are not available from the factory.
• Curb insulation, cant strips, flashing and general
roofing material are furnished by the contractor.
• The curbs must be supported on parallel sides by
roof members.
• The roof members must not penetrate supply and
return duct opening areas as damage to the unit
might occur.
NOTE: The unit and curb accessories are designed
to allow vertical duct installation before
unit placement. Duct installation after unit
placement is not recommended.
All curbs look similar. To avoid incorrect
curb positioning, check job plans carefully
and verify markings on curb assembly.
Instructions may vary in curb styles and
supersedes information shown.
See the manual shipped with the roof curb for assembly
and installation instructions.
CLEARANCES
Unit Clearances
*In situations that have multiple units, a 36" minimum
clearance is required between the condenser coils.
CAUTION
Adequate clearance around the unit should be kept for
safety, service, maintenance, and proper unit operation. A
clearance of 48" is recommended on all sides of the unit
to facilitate possible parts replacement, to allow service
access and to insure proper ventilation and condenser
airflow. The top of the unit should be completely
unobstructed. If units are to be located under an overhang,
there should be a minimum of 48" clearance and provisions
made to deflect the warm discharge air out from the
overhang. The unit should be installed remote from all
building exhausts to inhibit ingestion of exhaust air into the
unit fresh air intake.
Roof Curb Installation
ROOF CURB POST-INSTALLATION
After installation, check the top of the curb, duct connection
frame and duct flanges to make sure gasket has been
applied properly. Gasket should be firmly applied to the top
of the curb perimeter, duct flanges and any exposed duct
connection frame. If gasket is loose, re-apply using strong
weather resistant adhesive.
Protrusion
Inspect curb to ensure that none of the utility services
(electric) routed through the curb protrude above the curb.
If protrusions exist, do not attempt to set unit
on curb.
5
CHECKS
CAUTION
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