GPCH3 Installation Manual
5
36"
36"
24"
PLENUM
UNIT
PLATFORM
Ducting work should be fabricated by the installing
contractor in accordance with local codes. Industry manuals
may be used as a guide when sizing and designing the duct
The unit should be placed as close as possible to the space
to be air-conditioned allowing clearance dimensions as
indicated. Ducts should run as directly as possible to supply
at the unit to reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if
slab installation is recommended when the registers are low
to a suitable square to round duct converter. Your distributor
has a factory designed square to round converter transition.
The model #’s of these kits are as follows: Small Chassis
27.5” SQRPCH102, Large and Extra Large Chassis
the converter. The square to round converter is attached to
to the unit,
It is strongly encouraged to use appropriately sized ducts
duct sizing through industry manuals or air duct calculators
require larger ducts than converter openings, run larger duct
size up to unit converter openings and reduce with a reducer
10x20 1.4
14x20 1.9
14x25 2.4
15x20 2.1
16x20 2.2
16x25 2.8
20x20 2.8
20x25 3.5
25x25 4.3
OUTER FLANGE
STARTER FLANGE
SQUARE TO ROUND
DUCT CONVERTER PANEL
500 1000 1500 2000 2500 3000 3500
7
6
5
4
3
2
Airflow - SCFM
Nominal Filter Area
Square Feet