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 TB 740-97-4
reactivation air inlet side and turned downward 45 o to prevent the entry of water.
(b) Duct installation . Four-inch-diameter, No. 26 gage, galvanized sheet metal ducts, with necessary ells, reducing
fittings, and connections will be installed, generally, as shown on figure 62. Suitable penetrations, large enough to permit
the introduction of the air ducts and the mounting of a sensing element, will be provided in the cockpit cover of each boat.
The dry air will penetrate one end of the cover and will be removed from the opposite end.
(c) Ductwork supports. Ductwork run on the deck will be supported on wood or metal stanchions. The ducts will be
secured to the stanchions by galvanized metal strapping.
(d) Machine connections. Connections of ducts to the dehumidification machine will be made with unions or slip joint
connections, which permit easy removal of the machine for servicing.
(e) Humidistat. A hair-type humidistat will be set to maintain a 40-percent relative humidity, plus or minus 5 percent,
within the dehumidified areas. The humidistat will be installed in the cockpit of the boat, from which the moist-air
ductwork is connected to the dehumidification machine. The humidistat will be mounted so that it is protected against
movement and damage. Rubber covered electrical cable, with suitable terminal connectors, will be installed to connect the
humidistat to the dehumidification machine. Provisions will be made to prevent movement of the cable at the point where
it leaves the dehumidified area.
(f) Sensing elements. Humidity sensing elements, without cable, will be installed, generally, as shown on figure 62.
One sensing element will be mounted in the cockpit cover of each boat.
R-2
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