Materials & Construction
The standard features of the rolling grille doors include 5/16” galvanized steel horizontal rods,
continuous from jamb to jamb, and covered with aluminum tubes.
Vertical links are aluminum. End links ensure that the grille cannot
be pulled from guides. The links are made of 1/8” (standard)
or 3/16” (heavy-duty) aluminum. The bottom bar is a tubular aluminum
extrusion, fitted with nylon end caps which act as bearing surfaces.
Optional cylinder lock assembly in bottom bar activates concealed
3/8” steel tamperproof lock rods. The lock uses standard mortise
cylinder, and is also available with an optional removable core.
Center locks are available up to 25' wide.
Aluminum grille patterns are available in clear anodized, mill
(standard), or bronze
anodized finishes. Optional materials are finished stainless
steel and/or galvanized steel.
Powder coating is available in multiple colors. Powder coating is a
dry finishing process in which finely ground particles of pigment
and resin are electro statically charged and sprayed onto the
electrically grounded parts of rolling doors. These charged particles
adhere to the rolling door parts until they melt and fuse into a
solid coating in a curing oven. The result is a finish that radiates
beauty and smoothness for an aesthetically pleasing grille.
Operation can be manual push-up, chain, hand crank, or motor-operated.
Door mounting can be self-supporting, using structural tubes, or
directly attached to the building structure. Hand crank may
be fixed or removable.
The counterbalance assembly consists of a spring barrel which serves
as a load-carrying beam. It encases the counterbalance mechanism and
provides the axis around which the curtain coils. (Deflection is
limited to 0.033" per lineal foot of span.) If required, barrel
rings of malleable iron or stamped steel may be provided to assure
the proper counterbalance. Oil-tempered, torsion-type counterbalance
springs are wound from heat-treated steel, providing accuracy in
balancing the door. Barrel plugs connect ends of springs to barrel
and tension rod. Tension rod of steel shafting holds fixed ends of
springs and carries torsion load of spring counterbalance. A spring tension adjusting wheel is normally mounted outside the
bracket on end of tension rod. An inside adjusting wheel for "tight"
side-room applications is available in limited sizes.
An optional hood cover encloses curtain coil and counterbalance
mechanism and is made to match the grille finish.
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