indicated, from one mm 20 gauge thick mill galvanized sheet metal.
Where sleeves are installed in bearing walls or partitions, provide
black steel pipe conforming with ASTM A 53/A 53M, Schedule 20.
b. Framed Prepared Openings: Fabricate framed prepared openings from
one mm 20 gauge galvanized steel, unless otherwise indicated.
c. Insulation: Provide duct insulation in accordance with Section 15080
THERMAL INSULATION FOR MECHANICAL SYSTEMS continuous through sleeves
and prepared openings except firewall penetrations. Terminate duct
insulation at fire dampers and flexible connections. For duct handling
air at or below 16 degrees C 60 degrees F, provide insulation
continuous over the damper collar and retaining angle of fire dampers,
which are exposed to unconditioned air.
d. Closure Collars: Provide closure collars of a minimum 100 mm four
inches wide, unless otherwise indicated, for exposed ducts and items on
each side of penetrated surface, except where equipment is installed.
Install collar tight against the surface and fit snugly around the duct
or insulation. Grind sharp edges smooth to prevent damage to
penetrating surface. Fabricate collars for round ducts 380 mm 15 inches
in diameter or less from one mm 20 gauge galvanized steel. Fabricate
collars for square and rectangular ducts, or round ducts with minimum
dimension over 380 mm 15 inches from 1.40 mm 18 gauge galvanized steel.
Fabricate collars for square and rectangular ducts with a maximum side
of 380 mm 15 inches or less from one mm 20 gauge galvanized steel.
Install collars with fasteners a maximum of 150 mm six inches on
center. Attach to collars a minimum of 4 fasteners where the opening
is 300 mm 12 inches in diameter or less, and a minimum of 8 fasteners
where the opening is 500 mm 20 inches in diameter or less.
e. Firestopping: Where ducts pass through fire-rated walls, fire
partitions, and fire rated chase walls, seal the penetration with fire
stopping materials as specified in Section 07840 FIRESTOPPING.
3.3
FIELD PAINTING AND IDENTIFICATION SYSTEMS
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NOTE: There is a similar requirement for
identification in Section 15400A PLUMBING, GENERAL
PURPOSE. The designer will ensure that color coding
for all mechanical systems is coordinated.
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3.3.1
Identification Tags
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NOTE: Delete when identification tags are not
considered necessary on small projects.
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Provide identification tags made of brass, engraved laminated plastic, or
engraved anodized aluminum, indicating service and item number on all
valves and dampers. Tags shall be 35 mm 1-3/8 inch minimum diameter and
marking shall be stamped or engraved. Indentations shall be black for
reading clarity. Tags shall be attached to valves with No. 12 AWG, copper
wire, chrome-plated beaded chain or plastic straps designed for that
purpose.
SECTION 15895
Page 60
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