【文章內(nèi)容簡(jiǎn)介】 may be partly louvered and partly paneled. ? The louvers are arranged in inclined fashion thus obstructs the vision but permits entry of air. ? Louvers may be fixed or movable. ? Louvers may be of timber, plywood or glass. ? However, they are difficult to clean. inside outside PARTLY LOUVERED AND PARTLY PANELED DOOR Revolving doors ? Such types are provided in public buildings, like banks, museums, hotels, offices etc. A revolving door normally has four wings/leaves that hang on a center shaft and rotate one way about a vertical axis within a round enclosure. The central shaft is fitted with ball bearing arrangement at the bottom, which allows the shutters to move without any jerk and making noise. The radiating shutters may be fully paneled, fully glazed or partly glazed. The glass doors allow people to see and anticipate each other while walking through. Vertical rubber pieces are provided at the rubbing end of the shutter to prevent drought of air. People can walk out of and into the building at the same time. The door closes automatically when not in use. ? Revolving doors are energy efficient by eliminating drafts, thus reducing the heating or cooling required for the building. ? The door may be motorized, or pushed manually using push bars. Revolving doors therefore create a good seal from the outside and help to reduce A/C and heating costs for climate control from the building. ? Revolving doors typically have a speed control to prevent people from spinning the doors too fast. Sliding doors ? In these doors, the shutter slide horizontally along tracks with the help of runners and rails. often for space or ? Sliding glass doors are mon in places where there is no space to swing the door. ? Such doors are very popular for use for the entrances to mercial structures and also in residential buildings for aesthetic considerations. . ? Sliding doors consist of either one, two or three doors that slide by each other on a track depending upon the size of opening and space available for sliding. ? They are pretty easily cleaned and maintained. ? These doors sound insulation is pretty poor usually, and they must be of high quality and fitted exactly in their tracks or else they may slide out of them. ? When fully open these doors will allow half the space of the opening in double sliding doors, or one third if triple. ? Sliding doors move along metal, wood, or vinyl tracks fitted into their frames at the top and bottom. To ease their movement, sliding doors often have plastic rollers attached to the top and bottom or to the bottom only. ? The door is hung by two trolley hangers at the top of the door running in a concealed track while at the bottom, rollers are provided to slide the shutter in a channel track. Swing doors ? The shutter is fitted to its frame by special double action hinges. ? The hinges permits the shutter to move both ways, inward as well as outward. ? The doors are not rebated at the meeting styles. ? To open the door, a slight push is made and the spring action brings the shutter in closed position. The return of the shutter is with force and thus, the door shall be either fully glazed Or provided with a peep hole at eye level, to avoid accidents. Folded doors Made of many narrow vertical strips or creases that fold back to back into a pact bundle when doors are pushed open, these strips or creases will be hanged from the top, and run on a track. They save space as they do not swing out of the door opening, though their sound and weather isolation is poor. Folding doors are usually pretty noisy, and considered not so durable Collapsible Door ? Such doors are used in garages, workshops, public buildings etc. to provide increased safety and protection to property. ? The doors do not require hinges to close or open the shutter nor the frame to hang them. ? It acts like a steel curtain. ? The door is made up from vertical double channels (20x10x2 mm), jointed together with the hollows on the inside to create a vertical gap. ? These channels are spaced at 100120 mm apart and braced with diagonal iron flats. ? These diagonals allow the shutter to open or closed. ? The shutter operate between two rails, one fixed to the floor and other to the lintel. ? Rollers are mounted at the top and bottom. Rolling shutter ? These are monly used for shops, godowns, stores etc. ? The door shutter acts like a curtain and thus provides adequate protection and safety against fire and thefts. ? The shutter is made up of thin steel slabs called laths or slates about mm thick interlocked to each other and coiled upon specially designed pipe shaft called drum mounted at the top. ? The shutter moves in two vertical steel guide channels installed at their ends. ? The channel is made up of steel sheets and deep enough to acmodate the shu