[2.9.5
Security Bars
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NOTE: Use this paragraph for brig facilities only.
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Security bars shall be as detailed.
]2.10
DEFLECTORS
Factory-fabricated and factory- or field-assembled units consisting of
curved turning vanes [or scoop type extractors] for uniform air
distribution and change of direction with minimum turbulence and pressure
loss. Provide curved vanes for square elbows. [For round ducts taking off
from rectangular ducts, provide factory fabricated, galvanized sheet metal,
spin-in fittings. These fittings shall have scoop extractors, butterfly
dampers, and locking quadrant operators.]
2.11
ACCESS DOORS
Door shall be rigid and airtight with neoprene gaskets and two or more
[chrome-plated [with copper or nickel base]] [enamel [painted]
[galvanized]] steel hinges and quick fastening locking devices. Provide
doors as large as practical. Mount doors, if possible, so that air
pressure holds them closed. As an alternative, removable access doors may
be used. These access doors shall be constructed from stamped sheet metal
and consist of an inner and outer door panel. Where insulated doors are
needed, the inner door shall consist of two panels spot-welded together
which totally encapsulate fiberglass insulation. The inner and outer doors
shall be joined by bolts and threaded handles in such a configuration that
the panels can be drawn together to secure the door to the duct in a
sandwich fashion. The handles shall be high impact plastic with threaded
metal inserts. Conical springs shall be used between the door panels to
facilitate installation and removal of the door. Neoprene gasket shall be
used around the outside edge of the inner or outer panel, but not both, to
seal the door. This type of door is approved for use on rectangular, round
and flat-oval ductwork.
2.12
DAMPERS AND LOUVERS
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NOTE: The design should indicate the type of
dampers to be provided on the equipment schedules.
Dampers must be provided on every take-off for
balancing purposes. Opposed blade dampers may be
required in some instances to ensure proper air
mixing, but not for all customers.
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Construct dampers and louvers with galvanized sheet metal two gages heavier
than ducts in which installed. Except as modified herein, the construction
shall be of aluminum or galvanized steel with interlocking edges and maximum
250 mm 10 inch blade width. [Dampers shall be opposed-blade type [where
indicated]. Damper blades shall be connected to the damper frame with a
non-metallic anti-friction bushing. The blades shall be connected to the
frame with a galvanized, zinc coated steel anti-friction bearing pin. The
pin shall consist of a single or double row sealed, stainless steel,
maintenance free, roller or ball bearing, lubricated for life with a full
stroke test of 200,000 or more strokes in accordance with UL 555S. The
SECTION 15810N
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