Roofcurbs Supplied by Venmar CES (External Applications Only)
Roofcurbs supplied by Venmar CES should be mounted
as follows:
• The roofcurb is shipped knocked-down with assem-
bly hardware and instructions provided. The roofcurb
must be field erected, assembled and set in place by
the Installing Contractor.
• Roofcurb dimensions are submitted with the unit
mechanical drawings which can also be found in the
unit control panel pocket or by calling Technical Sup-
port personnel from the Venmar CES factory.
• After the roofcurb has been assembled, ensure that
the roofcurb dimensions suit the unit for which it is
designated.
• The cross members must be positioned as per
the roofcurb drawing. Field supply and install addi-
tional cross members completing the perimeter and
matching the unit opening dimensions to properly
support the ductwork plenums for bottom vertical
return and supply connections and for stability.
• Ensure that the assembled roofcurb is square, plumb
and level to within 1/16” [1.6 mm] over the entire
length. The building structure must provide continu-
ous structural support to the full perimeter of the
roofcurb and all cross members requiring support.
The roofcurb may be shimmed as required to pro-
vide continuous support.
• The roofcurb must be fastened to the building structure.
• The Installing Contractor is responsible for making the
roofcurb water-tight by caulking all roofcurb joints.
Roofcurbs Supplied by Others
Roofcurbs supplied by others must be designed with the
same dimensions and cross member arrangement as per
Venmar CES roofcurb drawings and must be designed to
evenly withstand perimeter and cross section static loads.
IMPORTANT
Venmar CES is not liable for any damages, costs or other
issues arising from roofcurbs supplied by others.
IMPORTANT
The following items must be completed prior to setting
the unit on the roofcurb:
• The roofcurb roofing must be completed including
insulation, cant strip, flashing and counter-flashing.
• Vertical ductwork must be attached to the roofcurb
cross members and building structure, not to the
unit. See the mechanical drawings for information
on roofcurb installation, recommended ductwork
attachment and dimensions.
• If there is no building roof access underneath the
unit and drain or piping connections must be made
(in the roofing), it is recommended to do so before
unit installation using the appropriate materials pro-
vided by the Installing Contractor.
• Remove the length of 3/8” x 1½” [9.5 x 38 mm]
polyvinyl gasket strip with adhesive backing sup-
plied with the unit and apply a continuous strip to
the top perimeter of the roofcurb and duct opening
connections for an air- and water-tight seal.
IMPORTANT
The gasket between the unit and the roofcurb is critical
for an air- and water-tight seal. An improperly applied
gasket can result in air and water leakage and poor unit
performance. Position the unit with equal spacing all
around between the roofcurb and inside unit base rail
using ½” [13 mm] wood shims as it is being lowered.
VCES-VHC-IOM-1F – VHC-36, -42 & -50
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