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| Rolling Service Door
Standard Specifications
Furnish and Install
rolling service doors as
indicated. Doors shall be as manufactured by
Mahon Door Corporation.
Cutains
are to be formed of (galvanized steel),
(aluminum), (stainless steel) interlocking
slats designed to withstand a windload of 20
pounds per square foot. Windlocks to be
furnished where required by opening span, or
for heavier windload requirements. Steel
slats shall be galvanized per ASTM
standards, chemically treated for paint
adhesion. Both ends of alternate slats to be
equipped with endlocks. The bottom of each
curtain shall be reinforced with two (2)
(steel), (aluminum), (stainless steel)
angles of equal weight or extruded aluminum
bottom bar assembly standard on all doors up
to 16’-0” unless specified otherwise.
Counterbalance Assemble
shall be
furnished with oil tempered helical torsion
springs having a 25% safety factor. Springs
shall be fixed to tapered cast anchors,
mounted on a single steel torsion rod.
Torsion rod to be attatched to a spring
adjusting wheel, adjustable without removing
the hood. Entire spring assembly to be
housed in a steel pipe shaft of proper
diameter and thickness so not to exceed .03”
of deflection per foot of span.
Braket Plates
are to be of steel
plate with sealed ball bearings to support
counterbalance assembly and door curtain.
Brackets to form end closures and support
hood.
Hoods
shall not be less than 24 Gauge (galvanized
steel), (aluminum), (stainless steel),
contour to fit end brackets, and reinforced
with stiffening beads at top and bottom
edges.
Guides
are to be fabricated of (steel), (aluminum),
(stainless steel) angles of not less than
3/16” thick. Depth of guides to be
sufficient to retain curtain under windload
specified. If windlocks are required, guides
will be furnished with windlock retainers.
Guides to be assembled with 3/8” bolts,
bolted to jambs at spacings not exceeding
3’-0” on centers, bellmouths and door stops
are incorporated into guide assemblies as
standard.
Operation
is to be (manual, with lift handles), (hand
chain and gear, maximum of 35 pounds of
pull), (hand crank gear), (motor operator).
Locking
with provision for padlocks
by means of (slide bolts on manual doors),
(chain lock keeper for chain operated
doors), (locking disc for crank operated
doors), (self-locking gearing on motor
operated doors), with chain lock for
emergency hand chain.
Finish
steel surfaces to
receive one shop coat of prime paint except
galvanized surfaces, bearings, etc. For
aluminum finish shall be (mill), (anodized),
(duranodic). For stainless steel finish
shall be (mill),
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