SECTION 08 1174 – SLIDING METAL GRILLES
Sliding Metal Grilles provide secure separation from circulation areas in, for example, a shopping mall and the retail stores after closing. They are manually operated, horizontally sliding with or without a pocket for storage at the end wall. There are top and bottom plates, with the top having a trolley wheel supported by an overhead track. Vertical posts are provided, of various types and configurations with bolts that drop into a floor socket to stabilize the grill when closed. Grill panels may be open for air circulation or closed off with solid or perforated sheets of various materials. Layouts of grilles vary from straight to curved, and single to bi-parting with an assortment of vertical posts depending on the application.
Grilles consist of vertical folding panels of various widths with an accordion type of fold. These panel widths have been noted as body styles in the section; Narrow body, Standard body, and Wide body. The panels may be open, or filled in with glass, polycarbonate, solid or perforated aluminum sheet, and perforated steel sheet. Open panels are connected with metal rods that may have a straight or staggered profile at an established vertical on center spacing.
Aluminum plates are at the top and bottom of each panel, and the height of these plates varies based on panel type and manufacturer. An extruded aluminum track supports the grill along the top, and the tracks structural capacity needs to be designed for support of the entire grill in the event it is folded up as it is moved along the track. Height of the grill is typically limited to 12 feet for the narrow body style, and 14 feet high for the others. Their width is unlimited as long as intermediate posts are provided at an appropriate spacing, typically 10 feet on center.
Curves may be incorporated into the grill layout, and the use of specific curves to standardize track fabrications are recommended, such as 90 degrees, 120 degrees, 135 degrees, and 150 degrees. Each of these has a unique radius used at the curve, typically 10 inches, but verify with panel manufacturer. These curves may be gradual, an S-curve, or at 90 degrees to turn through a corner. Curves may also be laid out to stack the grill in a remote pocket to eliminate view of grill at entrance when not in use.
Pockets may be provided for storing the grilles. Only a standard 6 inch metal stud cavity is required for narrow body style panels. The wider body style panels may also be stacked in a pocket, but the width is determined by folded panel width and pocket door sizes available from the manufacturers. Grill pockets typically consist of a welded tubular frame with suitable clearance and depth of folded panels. Typical clearances for pocket with narrow body panel is 5 inches, standard body panel is 8 inches, and wide body panel is 13 inches, but verify with panel manufacturer.
There are also various types of posts that may be used for the Sliding Metal Grilles. A full height permanently mounted wall channel is used for the lead post to fit into with a hook-bolt lock.
A lead post is the first out of the stack area and to extend across the opening.
A bi-parting post is also the first out of the stack area when grilles are over 30 feet wide for ease of operation, and for wide body grilles with post spaced every 10 feet. These bi-parting posts have a drop bolt floor socket to stabilize the grill, and possibly a thumb turn on the interior and a cylinder on the exterior side to lock the post.
An intermediate post is provided in the middle of full height grills no more than 10 feet on center, and on or near the center of curves. They have a drop bolt floor socket to stabilize the grill and may also have a keyed cylinder to lock the post.
A traveling end post is the last post of a traveling grill and abuts the back wall of the pocket when fully extended. A post “top stop” locks into a header stopper and the “bottom stop” locks into a “V” stop on the floor inside the pocket. This post also has a full height protection plate attached on the out-board side to provide protection as it butts against the back wall of pocket when grill is fully extended.
A top and bottom locking post is a modified lead post or end post that has a top and bottom lock; upper lock is lift bolt that protrudes into track and header, bottom lock is spring loaded drop bolt floor socket, and possibly a thumb turn on the interior and a cylinder on the exterior side to lock the post.
A fixed end post is the end post of the grill and permanently anchored to the wall.
For two separate grilles that meet at a 90 degree corner, a 90 degree bi-parting post is used. This bi-parting post consists of an intermediate post on end of one grill and having a wall channel attached to one side that provides a lockable anchorage for the lead post on the end of second grill. This post would have an upper lift bolt and bottom drop bolt floor socket to stabilize the grill, and possibly a thumb turn on the interior and a cylinder on the exterior side to lock the post.
There are various finishes available for the aluminum components that make up the various grill configurations. Aluminum finishes are either clear, or a selection of color anodized aluminum colors. Metals may also be finished with a powder coating and acrylic paint, but verify with panel manufacturer.
Editing of Section 08 1174 – Sliding Metal Grilles is designed to start in PART 2 - PRODUCTS, progress to PART 3 - EXECUTION, and finish up with PART 1 - GENERAL. The various styles, components, material and finish options comprise the main articles in PART 2.
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