Greenheck DGK (468695) - Manual (Page 4)

4
NOTE
The use of all lifting brackets and a set of spreader
bars is mandatory when lifting unit.
4. Install Unit: Use a crane and a set of spreader bars
hooked to the
factory lifting lugs
to lift and center
the unit on the
curb/equipment
support(s).
Use self-tapping
sheet metal screws
to fasten the unit to
the curb/equipment
support(s).
3. Apply Sealant: Apply an appropriate sealant around
the perimeter of the curb to isolate fan vibration and
prevent water penetration.
Supply Air Ductwork
(Arrangement DB only) Sealant
Installation of Arrangement DB / HZ
1. Install Curb or Equipment Support(s): Position
curb/equipment support(s) on the roof. (Reference
the CAPS submittal for placement of curb/equipment
support(s) in relation to the unit). Verify that unit
supports are level, shim if necessary. Attach curb
to roof and flash into place. Attach the equipment
support(s) to the roof, remove metal cover, flash to
wooden nailer and reinstall cover. Refer to roof curb
detail.
Roof Curb
NOTE
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the ductwork
with the supply unit. The duct adapter is only a
guide and is not to be used as a support for the
ductwork.
2. Install Ductwork: Good duct practices should be
followed for all ductwork. All ductwork should be
installed in accordance with SMACNA and AMCA
guidelines, NFPA 96 and all local codes.
Model
Supply
Duct Size
(A x B)
Distance from
right side of
Curb to Center
Supply Duct (C)
Curb
Dimension
Actual
(D x E)
DGK-109-H15 13 x 14
141/2 271/2 x 271/2 DGK-110-H15 14 x 16
DGK-112-H15 16 x 18
DGK-115-H25 18 x 22
20 451/2 x 451/2
DGK-118-H25 22 x 24
All dimensions shown are in inches.
SUPPLY
DUCT
B 23 in.
(584 mm)
A
23 in.
(584 mm)
27.5 in.
(699 mm)
Curb Length Actual
27.5 in.
(699 mm)
Curb
Width
Actual
Recommended Roof Opening
(center in curb)
Center Supply Duct
in Roof Opening
Airflow
Airflow
D
SUPPLY
DUCT
A
C
B E
Note: Roof openings can be as large as the curb size minus
31/2 in. or as small as the duct size plus 1/2 in.
Supply Duct width (B) is centered over Curb width (E).
Supply Length (A) may not be centered over Curb Length (D).
Roof Opening Details
Model DGK Make-Up Air
®