Chamberlains Power Drive® and Whisper Drive® belong to the residential garage door opener category in the do-it-yourself range. The Elite(TM) range contains premier residential and commercial gate operators and access control systems. The Sentex® range is for secure residential and commercial garages. Sears Holdings Corporation, parent of Kmart and Sears, Roebuck and Co., is the third largest broad line retailer in the US. Sears Holdings is a leading supplier of tools, lawn and garden, home electronics, and automotive repair and maintenance. It supplies the Craftsman range of garage door openers.
They are available as a prefabricated kit, or built as a custom design to complement the dacor of any building. Commercial warehouse type installations often dictate higher security requirements. A good choice for this security type of door is the "roll-up" style that resembles a roll top desk type of door. This door can be manufactured with a variety of materials that can be as strong as the adjacent walls, making forced entry through this opening very difficult. Other common commercial installations include light weight aluminum single or sectional panel doors. These doors function more for closing off an already secured area than for assuring point security.
In most installations, a warning tag is left attached adjacent to the torsion spring when the garage door is installed. This tag warns of the danger associated with the stored energy of this spring, and alerts untrained individuals to not attempt any repair, adjustment or to even touch the spring and associated hardware. When the label that should be attached to this spring becomes damaged, is removed or tampered with, it is important that a new warning label be reattached immediately to show the dangers of this spring tension
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