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Dometic turbo a/c systems
as straight, smooth and taut as possible minimizing
the number of 90° bends (two 90° bends can reduce
airflow by 25%). The table in Figure 5 shows minimum
duct diameters and their corresponding supply and
return air grill minimum areas in square inches. If a
transition box is used, the total area of supply air
ducts going out of the box should at least equal the
area of the supply duct going in to the box.
The following is a summary of proper ducting connec-
tions. See Figure 6.
1. Pull back the fiberglass insulation exposing the
inner mylar duct hose.
2. Slide the mylar duct hose around the mount ring
until it bottoms out.
3. Screw 3 or 4 stainless steel sheet metal screws
through the duct hose into the transition ring. Make
sure to catch the wire in the duct hose with the heads
of the screws. Do not use band clamps, as the hose
will slide off.
4. Wrap duct tape around the ducting and ring joint to
prevent any air leaks.
5. Pull the insulation back up over the mylar to the ring
and tape this joint.
6. Remove excess ducting and use the same connec-
tion method at the supply air grill.
turbo model capacity
Minimum Duct Diameter (in/mm)
Minimum Duct Area (sq in/cm)
Minimum R/A Grill (sq in/cm)
Minimum S/A Grill (sq in/cm)
FIGURE 5. Minimum duct and grill sizes
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all ducting should:
• Be appropriately sized for each application.
• Run as smoothly and taut as possible.
• Have as few bends or loops as possible.
• Be securely fastened to prevent sagging during
boat operation.
• Have all excess ducting lengths trimmed off.
• 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.
• Do not route ducting through engine room or any
area where it may be exposed to dangerous vapors
or exhaust fumes.
seawater system
Several guidelines should be followed during the
installation of the seawater system. If the circulation
pump is centrifugal and not self-priming, it must be
mounted so that it is always at least one foot below
the water line regardless of which tack the vessel is
on. Pump may be mounted horizontally or vertically,
minimum Duct and Grill sizes
6K
8K
4/102
5/127
12.6/81
19.6/126
28.3/183
64/413
80/516
100/645
32/206
48/310
60/387
installation
10K
12K
6/152
6/152
28.3/183
38.5/248
130/839
144/929
70/452
76/490
14K
16K
7/178
7/178
38.5/248
160/1032
80/516
10
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