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Miscellaneous Doors. Miscellaneous Doors. The wide varieties of specialized doors are each designed to fill a particular need. Among these are rolling grilles, which roll horizontally or vertically to provide protection or control traffic. Other specialty doors are revolving, dumbwaiter, rubber shock-absorbing doors, cooler and freezer doors as well as blast-and bulletproof doors. The estimating procedures are basically the same, regardless of the type of door required.Folding Doors and Partitions. Folding (accordion) doors and partitions offer the advantage of increased flexibility and more efficient use of the floor space in a building. They are available in fiberglass, vinyl, and wood, or in combinations of these materials. They can be made to form a radius, and have concealed pockets and overhead track; a variety of hardware is also available. Depending on the type of construction, the maximum opening height ranges from 8 to 21 feet and the width from 8 to 30 feet. The doors may be of steel construction with a covering, rigid fiberboard panels, laminated wood, or solid wood panels. Specially constructed dividers are also available with higher sound-control ratings. The exact type required will be found in the specifications, as will the hardware requirements. Both the specifications and drawings must be checked for installation details and the opening sizes required. 15-4 PREFITTING AND MACHINING (PREMACHINING) DOORS The doors may be machined at the factory to receive various types of hardware. Factory machining can prepare the door to receive cylindrical, tubular, mortise, unit, and rim locks. Other hardware such as finger pulls, door closers, flush catchers, and hinges (butts) are also provided for. Bevels are put on the doors, and any special requirements are handled. Premachining is popular as it cuts job labor costs to a minimum, but coordination is important because the work is done at the factory from the hardware manufacturer’s templates. This means that approved shop drawings, hardware and door schedules, and the hardware manufacturer’s templates must be supplied to the door manufacturer. From he estimator’s point of view, premachining takes an item that is difficult to estimate and simplifies it considerably. Except where skilled door hangers are available, premachined doors offer cost control with maximum results. For this reason, they are being used more and more frequently.
2007年01月21日 12点01分
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