CTM Marine Self-Contained CT Installation & User Manual
13
Ducting
Good airflow is critical for the performance of the entire system. It is highly
dependent on the quality of the ducting installation. The ducting should be run
as straight, smooth and taut as possible minimizing the number of 90° bends (two 90°
bends can reduce airflow by 25%).
All ducting should:
>
Be appropriately sized for each application.
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Run as smoothly and taut as possible.
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Have as few bends or loops as possible.
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Be securely fastened to prevent sagging during boat operation.
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Have all excess ducting lengths trimmed off.
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Not be flattened or kinked.
>
Insulated when located in high heat load areas (hull side,
mechanical compartments, etc.).
>
Be properly protected against potential damage when
routed through open areas.
1.
Slide back the fiberglass insulation duct to reveal the inner mylar duct
hose.
2.
Put the mylar duct hose around the mount ring.
3.
To make sure the mylar duct hose doesn't slide out, screw 3-4 stainless
steel screws through the duct hose into the mount ring. Make sure a few
wires from the mylar duct are captured by the screws.
4.
Slide back the fiberglass insulation duct and cover the inner mylar duct
hose, and mount ring. Secure with high-quality aluminum foil tape or any
condensation inhibiting tape. See figure 6.
Fiberglass Insulation Duct
Inner Mylar Duct Hose
Mount Ring
Screws
Scre w
s
Aluminum Foil Tape
1
2
3
4
Figure 6
>
If you install a transition box,
make sure that the total area of
supply air ducts going out of the
transition box is at least equal to the
area of the supply duct going into the
box.
>
The supply air grille should be installed
as high as possible in such a manner that
provides a uniform air distribution
throughout the cabin.
>
The return air grille should be located
as low as possible and as close to the a/c
unit as possible.
CARBONMONOXIDE HAZARD
>
Do not route ducting through
engine room or any area where
it may be exposed to dangerous vapors
or exhaust fumes.
!
>
Refer to the Minimum Duct Air
Grille Sizes per BTU Capacity
table on page 6, for duct and grille size
references.
