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Recommended Roof Openings
Model A B C D
APEX-200 86 44 68.75 44
All dimensions shown are in inches.
FIGURE 2: Recommended roof openings.
Rooftop units require curbs to be mounted first. The
duct connections must be located so they will be clear
of structural members of the building.
1. Factory Supplied Roof Curbs
Roof curbs are Model GKD, which are shipped in a
knockdown kit and require field assembly (by others).
Assembly instructions are included with the curb.
2. Cut Roof Opening and Locate Curb
Layout the unit roof openings such that the supply
discharge & exhaust inlet of the unit will line up with
the corresponding ductwork (refer to Recommended
Roof Openings). Do not make openings larger than
necessary. Be sure to allow for the recommended
service clearances. Keep the supply inlet of the unit
away from any other exhaust fans. Likewise, position
the exhaust discharge opening away from fresh air
intakes of any other equipment.
3. Install Curb
Locate curb over roof opening and fasten in place.
Check that the diagonal dimensions are within ±
1
⁄8
inch of each other and adjust as necessary. Shim as
required to level.
4. Set the Unit
Lift unit to a point directly above the curb and duct
openings. Guide unit while lowering to align with
duct openings. Roof curbs fit inside the unit base.
Make sure the unit is properly seated on the curb
and is level.
5. Duct Work
Installation of all ducts should be done in
accordance with SMACNA and AMCA guidelines.
Model L W
APEX-200 283.5 92.0
Roof Curb Mounting
Curb Outside Dimensions
Dimensions shown are in inches.
FIGURE 3: Duct dimensions.
Installation
Exhaust
Air
Intake
Outdoor
Air
Discharge
D
B
C
L
W
2.50
From Inside Curb
To Recommended
Roof Opening
A
R
OO
F
CU
RB
S
IDE
O
F
U
NI
T
BA
SE
2 IN. IN
SU
LATI
ON
0
.7
5
1.2
5
2.
00
2.
00
6
.
00
Unit Approx. Weight (lbs)
APEX-200 (without coils) 9,000
APEX-200 (with HW & CW coils) 12,000
Unit Weights (dry weights)
Duct Size:
80 in. x 30 in.
Dimensions based on Greenheck-supplied roof curb only!
FIGURE 4: Roof curb details.