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ORDINANCE NO. NS-1424 Page 2 "BOLT" is a metal bar which, when actuated, is pro- jected (or "thrown") either horizontally or vertically into a retaining member, such as a strike plate, to prevent a door from ~oving or opening. "BOLT PROJECTION (OR BOLT THROW)" is the distance from the edge of the door, at the bolt center line, to the far- thest point on the bolt in the projected position, when subjected to end pressure. "BURGLARY RESISTANT GLAZING" means those materials as defined in Underwriters Laboratories Bulletin 972. "COMMERICAL OR INDUSTRIAL BUILDING" is a building, or portion thereof, used for a purpose other than dwelling. "COMPONENT", as distinguished from a part, is a sub- assembly which combines with other components to make up a total door or window assembly. For example, the primary components of a door assembly include: door, lock, hinges, jamb/wall, jamb/strike and wall. "CYLINDER" is the subassembly of a lock containing the cylinder core, tumbler mechanism and the keyway. A double cylinder lock is one which has a key-actuated cylinder on both the exterior and interior of the door. "CYLINDER CORE OR CYLINDER PLUG" of a cylinder containing the keyway, the key to operate the lock mechanism. is the central part which is rotated by "CYLINDER GUARD" is a hardened metal ring or plate surrounding the otherwise exposed portion of a cylinder lock to resist cutting, drilling, prying, pulling, or wrenching with common tools. "DEADBOLT" is a lock bolt which does not have a spring action as opposed to a latch bolt, which does. The bolt must be actuated by a key and/or a knob or thumb turn and when projected becomes locked against return by end pres- sure. "DEAD LATCH" is a spring actuated latch bolt having a beveled end and incorporating a plunger which, when de- pressed, automatically locks the projected latch bolt against return by end pressure. "DOOR ASSEMBLY" means a unit composed of a group of parts or components which make up a closure for a passage- way through a wall. For the purposes of this Division, a door assembly consists of the following parts: doors; hinges; locking device or devices; operation contacts (such as handles, knobs, push plates); miscellaneous hardware and closures; the frame, including the head, threshold, and jambs plus the anchorage devices to the surrounding wall and a portion of the surrounding wall extending 36 inches from each side of the jambs and 16 inches above the head. "DOOR STOPS" are the projections along the top and sides of a door jamb which check the door's swinging action. "DOUBLE CYLINDER DEADBOLT" is a deadbolt which can be activated only by a key from either the interior or exte- rior of the building.