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 TB 740-97-4
unions or slip Joint connections, which permit easy removal of the machine for servicing. All materials will be galvanized.
(c) Duct extensions. Moist air will be removed from the lower portions of the interior of the boats by the use of duct
extensions. The extensions will be 43/4-inch diameter flexible hose conforming to MIL Spec H-8796. The flexible hose will
extend from the moist air return connection on each boat to approximately 18 inches above the water closet floor or the
engineroom deckplates, as applicable.
(d) Duct installation. A glass will be removed from the aft end of the cabin of each boat, port or starboard side, as
applicable, and stored as specified in a above. Minimum No. 26 gage, galvanized sheet metal or exterior grade plywood
blanks provided with openings to suit duct and sensing element installation will be fitted in the way of the glass removals.
The blank In the vent for the water closet will be provided with an opening, to permit the entrance of an air duct. Ductwork
and extensions will run, generally, as shown on figures 59 and 60.
(e) Ductwork supports. Ductwork will be supported on wood or metal stanchions. The duct will be fastened to the
stanchions by galvanized strapping.
(f) Humidistat. A hair-type humidistat will be set to maintain a 40-percent relative humidity, plus or minus 5 percent,
within the dehumidified area. The humidistat will be installed in the cabin of the boat from which the humid air ductwork is
connected to the dehumidification machine. The humidistat will be mounted approximately 24 inches above the engine
compartment deck level and approximately 3 feet from the intake end of the moist-air return flexible hose. The
manufacturer's Instructions will be followed In making electrical connections. The humidistat will be connected to the
dehumidification machine by means of No. 18, 2-conductor, rubber covered cable with suitable terminal connectors.
(g) Sensing elements. Humidity sensing elements will be mounted in a way of the metal blank on the aft cabin
window on each boat, with cable extending into the machinery compartment. The element will be secured against
movement.
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