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ROOF CURB ASSEMBLY INSTRUCTIONS
Frame Assembly
1. Stand one end piece (locking tabs) and one side
piece (slots) vertically on the floor or roof.
2. Raise the corner of the end piece (locking tabs)
slightly and mate with side piece (slots). Ensure
that lower locking tab with leading edge is through
slot opening.
3. Push down on top edge of end piece. Ensure that
all 3 of the locking tabs are feeding into each
corresponding slot opening. Once both pieces are
flush, the process is complete.
4. Drive one spike provided into wood nailer strips at
each corner.
Frame Application and Location
This roof mounting frame provides necessary support when
the unit is installed. The frame can be installed directly on
deck having adequate structural strength or on roof
supports under deck.
Securing the Frame
To ensure proper mating with unit, it is critical that
mounting frame be squared to the roof, as follows:
1. With frame situated level in desired location on roof
trusses, tack weld one corner of frame.
2. Measure frame diagonally from one corner to the
opposite corner. Repeat with the remaining two
corners. These dimensions must be equal to the
frame to be square.
3. It is extremely important to sight frame from all
corners to ensure that the frame is not twisted
across top side. Shim frame under any low sides.
4. After frame has been squared, straightened, and
shimmed, weld or attach frame securely to the
roof.
• Max. slope tolerance: 1/16 in. per linear foot in any direction
• Note specification of duct location on bottom of HRV when positioning cross members (duct cavity).
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