connections, motor-driven fan, and [centrifugal atomizing-disk] [or] [water
pump with atomizing breaker-device]. Distribute air steam [radially in
each directions] [or] [in one or two directions]. Provide air filters of
humidifier-manufacturer's standard and nonferrous parts in contact with
water. Fan shall have fractional horsepower motor with stainless steel
shaft.
2.2.10.4
[Atomizing] [or] [Wetted Element]
[By-pass] [or] [duct]-mounted; capacities as indicated. Do not employ fan
or electric heating coil for normal operation of units. [Provide drain
outlet and [manual on-off switch] [saddle (manual shut-off) valve]
[remotely located] [or] [integral with each unit].] Materials shall be
corrosion resistant.
a.
Atomizing Units: UL 998 and UL listed, electric power units with
metered nozzle, relay, solenoid valve, sail switch, and integral
humidistat. Electrical characteristics shall be as indicated.
b.
Wetted Element Units: ARI 610 rated and ARI labeled, reservoir or
recirculating design units with a drain outlet, [automatic bleed]
and cock valve to permit manual draining of the drain pan.
2.3
RETURN-AIR FAN SECTIONS
[Centrifugal fan] [or] [vaneaxial fan] conforming to paragraph entitled
"Supply Blower (Fan) Sections."
2.4
GRAVITY VENTILATORS
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NOTE: For naval facilities at Adak, Alaska, the
entire assemblies of roof top or wall mounted
equipment shall be structurally strong enough to
resist 201 kilometers per hour 125 miles per hour
wind force. In the third sentence of paragraph
entitled "Power [Roof] [and] [Wall] Ventilators,"
delete "mounted under fan housings" for wall
ventilators.
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Factory-fabricated, [wind-driven rotary turbine,] minimum 24 gage
[galvanized sheet steel] [or] [aluminum], storm proof and raintight,
[self-flashing-prefabricated roof curbs,] [bird [and snow] screens,]
[removable hoods], and maximum static pressure of 12 Pa at L/s 0.05 inch at
cfm indicated. Provide [factory-fabricated roof curbs with continuous curb
gaskets] [flashing].
2.5
FAN-COIL UNITS
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NOTE: Use ARI seal and ARI 440, except that fan
coil units with refrigerant coils, steam coils, or
electric coils shall use UL 883 and UL seal. If a
dual fan-coil unit is used, provide separate access
panel or guards for each unit. ARI 440 is formerly
ARI 441. Older fan-coil units were rated under ARI
441. Fan-coil unit systems shall be two-pipe with
zoned system change-over capability where required.
SECTION 15720N
Page 19
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