This standard delineates the criteria for metal rolling shutters and rolling grills intended to provide security and protection in various building types. It addresses the selection of materials, design parameters, manufacturing, installation, and operational methods for manual, gear-driven, and motorized rolling systems. It serves as a vital reference for professionals engaged in the production or installation of robust and secure rolling shutter solutions.
Overview
This standard delineates the criteria for metal rolling shutters and rolling grills intended to provide security and protection in various building types. It addresses the selection of materials, design parameters, manufacturing, installation, and operational methods for manual, gear-driven, and motorized rolling systems. It serves as a vital reference for professionals engaged in the production or installation of robust and secure rolling shutter solutions.
Audience
Contents
Structure
This section outlines the design, materials, and installation requirements for metal rolling shutters, emphasizing guide channels and shutter positioning types. It classifies shutter types based on fixing positions such as inside above soffit, outside below soffit, and jamb projecting configurations. The section also specifies mild steel thickness and quality standards for components and outlines essential ordering information including shutter type and structural surroundings.
Defines key parts such as guide channels, rolls (drums), jambs, and soffits. Provides descriptions of shutter types according to their mounting location relative to the opening. Specifies steel material standards for components and explains the overall width measurement between guide channels.
Details the usage of hot-rolled mild steel sheets or plates with a minimum thickness of 3.15 mm for guide channels, brackets, and lock plates. Covers referenced Indian Standards for steel quality and provides bracket plate sizes correlated with shutter clear heights.
Explores different rolling shutter types including self-coiling manual, gear-driven mechanical, and electric motor-operated variants, highlighting their maximum clear opening areas. Describes fixing positions such as face-fixed and reveal-fixed mounts and details stopper height guidelines.
Lists shutter types along with their operational methods and permissible clear area sizes. Specifies clear opening dimensions and recommends rounding measurements for fabrication convenience. Addresses additional structural considerations affecting shutter installation.
Specifies mild steel for guide channels and lath sections, including thickness and surface quality requirements. Identifies standards applicable to steel pipes used for suspension shafts and tabulates bracket plate sizes based on shutter height.
Provides detailed material specifications for steel sheets and plates used in shutters. Summarizes shutter type classifications with their installation positions and bracket size charts. Emphasizes quality control and adherence to referenced standards for fabrication.
Describes operation methods of manual self-coiling, gear-operated, and electrically driven shutters including control mechanisms. Details motor specifications, control panel features, emergency manual operation provisions, and speed limitations for electric models.
Outlines design and material requirements for rolling grills including aluminium alloy or cold-rolled steel links and mild steel/aluminium bars. Explains their ventilation and visibility functions with less security compared to shutters. Describes combined shutter-grill assemblies with grill height restrictions and manual or electric operation.
Specifies marking of each shutter with manufacturer’s name or trademark and production year. Covers optional use of BIS Standard Mark to indicate conformity. Discusses painting requirements and purchaser’s responsibility to specify detailed order information.
Details packing methods for curtain assemblies, guide channels, brackets, and small parts. Highlights optional crating for protection during transit. Includes specification reminders and gear operation installation heights. Stresses purchaser communication for special features and dispatch requirements.
Reiterates clear and legible marking requirements including manufacturer identification and production date. Explains the purpose of markings for traceability and compliance. Provides bracket plate size guidelines and references painting standards.
Lists essential details purchasers must provide when ordering shutters, such as shutter type, construction around openings, presence of beams or sunshades, wall thickness, and any special features. Ensures proper design, manufacturing, and installation following the standard.
Frequently Asked
IS 6248 encompasses several types of rolling shutters categorized by their fixing methods and locations relative to the opening, including face-fixed, reveal-fixed, and lintel-fixed configurations. Additionally, the standard covers rolling grills, which share similar construction but provide ventilation and visibility. These are commonly used for securing entrances in commercial and industrial settings.
The guide channels must be fabricated from hot-rolled mild steel sheets or plates with a minimum thickness of 3.15 mm, featuring a deep channel cross-section free from surface defects and with cleanly sheared edges, complying with IS 5986-1970. They are hot-dip galvanized with a zinc coating of at least 230 g/m² for corrosion resistance. Lath sections also use mild steel of comparable quality and receive similar galvanization, ensuring durability in various environments.
Electrically operated rolling shutters employ a 3-phase, 400/440 V, 50 Hz AC motor linked to a worm shaft through chain drives, V-belts, or reduction gearboxes. A floor-level control lever allows disengagement of the motor to enable manual operation via an auxiliary chain drive during power outages. The motor is designed for easy removal without disrupting operation. Speed is controlled to a maximum of 10 cm/s. Control panels feature push-button starters with interlocks, overload protection, and limit switches to halt movement at travel boundaries, ensuring safe and reliable operation.
For rolling shutters with widths up to 2.5 meters, a robust and reinforced bottom lock plate is required to prevent accidental lifting or dropping. For shutters wider than 2.5 meters, at least one of the following safety devices must be installed: mechanical locking mechanisms or safety brakes/anti-fall devices. These measures are designed to prevent uncontrolled descent and enhance operational safety.
Rolling grills differ primarily in their curtain construction, utilizing aluminium alloy or cold-rolled steel links approximately 0.90 mm thick, or round bars with an 8 mm diameter, allowing for ventilation and visibility. While rolling shutters use solid steel or aluminium sheets to maximize security, rolling grills balance protection with airflow and display needs. Rolling grills are commonly used in showrooms and display areas, and combined shutter-grill assemblies limit grill height to 0.5 meters to maintain safety while providing ventilation.
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