]2.5
Slats, steel bottom bars, and hoods shall be hot-dip galvanized and shop
primed. Shop prime other parts of coiling doors, except faying surfaces.
2.5.1
Primed Finish
Clean surfaces thoroughly, treat to assure maximum paint adherence, and
provide a factory dip or spray coat of rust-inhibitive metallic oxide or
synthetic resin primer on exposed surfaces.
2.5.2
Galvanized and Shop-Primed Finish
Surfaces specified shall have a zinc coating, a phosphate treatment, and a
shop prime coat of rust-inhibitive paint. The galvanized coating shall
conform to ASTM A 653/A 653M, coating designation Z275 G90, for steel
sheets, except that hoods located on interior of the building may be Z180
G60, and ASTM A 123/A 123M for iron and steel products. The weight of
coatings for products shall be as designated in Table I of ASTM A 123/A 123M
for the thickness of base metal to be coated. The prime coat shall be a
type especially developed for materials treated by phosphates and adapted
to application by dipping or spraying. Repair damaged zinc-coated surfaces
by the materials and methods conforming to ASTM A 780 and spot prime. At
the option of the Contractor, a two-part system including bonderizing,
baked-on epoxy primer, and baked-on enamel top coat may be applied to slats
before forming, in lieu of prime coat specified.
2.6
ROLLING FIRE DOORS
Shall conform to the requirements specified herein and to NFPA 80 for the
class indicated. Doors shall bear labels of Underwriters Laboratories, or
another independent testing agency which has follow-up service and which
uses equivalent standards, indicating the applicable fire rating. The
construction details necessary for labeled doors shall take precedence over
details indicated or specified for service doors. Fire doors shall be
equipped with automatic closing mechanism actuated by fusible links. Doors
shall be forced into a closed position at a rate of descent of not more than
0.6 meters 2 feet per second and come to rest without impact. The curtain
shall be held against the sill until the release mechanism has been reset.
The automatic closing mechanism shall not interfere with normal operation
of the door. Fire doors shall be complete with hardware, accessories, and
automatic closing device as required by NFPA 80.
PART 3
EXECUTION
3.1
INSTALLATION
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NOTE: Structural steel door frames should be
specified in Section 05500, "Metal Fabrications."
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Install doors in accordance with approved detail drawings and
manufacturer's directions. Locate anchors and inserts for guides,
brackets, [motors,] [switches,] hardware, and other accessories accurately.
Upon completion, doors shall be weathertight and shall be free from warp,
twist, or distortion.
SECTION 08331N
Page 11
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