Metal Rolling Shutters and Rolling Grills

IS 6248: Scope Overview & Key Specifications

The code covers design, materials, and installation of rolling shutters with emphasis on guide channels and shutter positioning.

Key Points from Scope:

• Types of Shutters (Table 1):

  Designation	Positioning Description
  Type IA	Inside & above soffit, guide channels overlap jambs inside, roll on lintel face inside
  Type IB	Inside & below soffit, roll below soffit inside
  Type OA	Outside & above soffit, guide channels overlap jambs outside, roll on lintel face outside
  Type OB	Outside & below soffit, roll below soffit outside (e.g., with projecting sunshades)
  Type JPB	Jamb projecting & below soffit, guide channels project into opening, roll between jambs below soffit

• Material Specs (Clause 6.2):

  • Mild steel sheets/plates for guide channels, brackets, lock plates:
    • Hot-rolled steel
    • Thickness ≥ 3.15 mm
    • Free from surface defects, clean sheared edges

• Order Information (Clause 5.1):

  • Type of shutter (self-coiling, gear-operated, electric)
  • Construction around opening (brick, stone, concrete, steel)
  • Nearby beams/sunshades and clearances
  • Wall/column thickness for gear operation access

Summary Diagram of Shutter Types:

graph TD
  A[Shutter Types] --> IA[Type IA: Inside & Above Soffit]
  A --> IB[Type IB: Inside & Below Soffit]
  A --> OA[Type OA: Outside & Above Soffit]
  A --> OB[Type OB: Outside & Below Soffit]
  A --> JPB[Type JPB: Jamb Projecting & Below Soffit]

This scope ensures correct shutter placement, material quality, and details for ordering to suit structural and architectural conditions.

IS 6248: Definitions of Main Component Parts of Rolling Shutters

Key Definitions (Clause 2.0 & Fig. 1)

• Guide Channels: Vertical steel sections guiding the shutter curtain.
• Roll: Cylindrical drum on which the shutter curtain coils.
• Jambs: Vertical sides of the shutter opening.
• Soffit: Horizontal underside of the lintel or beam above the shutter.

Types of Rolling Shutters (Clause 4.1, Table 1)

Important Specification (Clause 6.2)

• Material: Hot-rolled mild steel sheets/plates, thickness ≥ 3.15 mm for guide channels, brackets, lock plates.
• Steel must be free from surface defects, edges cleanly sheared.

Overall Width (Clause 2.9)

• Distance between backs of two guide channels.

Summary Diagram of Component Parts (Conceptual)

graph TD
    A[Roll (Drum)] --> B[Shutter Curtain]
    B --> C[Guide Channels]
    C --> D[Jambs]
    D --> E[Wall Opening]
    A -.-> F[Soffit (Lintel underside)]

This concise overview covers main parts definitions, types, and material specs per IS 6248. For detailed dimensions and drawings, refer to Fig. 1 and full clauses of the standard.

IS 6248 - Key Materials Specifications & Tables

1. Mild Steel Sections (Clause 6.2)

• Material: Hot-rolled mild steel sheets/plates
• Minimum thickness: 3.15 mm
• Quality: Free from surface defects; edges cleanly sheared
• Standards referenced: IS 5986-1970 (Cold-rolled carbon steel strip), hot-rolled plates for cold-forming

2. Types of Shutters (Clause 4.1, Table 6)

3. Bracket Plate Sizes (Clause 7.4, Table 7.3)

Summary:

• Use hot-rolled mild steel ≥3.15 mm thick for guide channels, brackets, lock plates.
• Select bracket plate size based on shutter height as

IS 6248: Types of Rolling Shutters & Fixing Positions

1. Types of Rolling Shutters (Clause 5.1)

2. Fixing Positions (Clause 4.1 & Fig. 2)

• Rolling shutters are fixed based on standard positions relative to the opening (e.g., face-fixed, reveal-fixed, etc.).
• Refer to Table 1 and Fig. 2 in IS 6248 for detailed fixing types and dimensions.

3. Stopper Height (Clause 3.2.2)

• Max stopper height = Clear height of shutter - 10 cm
• Special cases allow stopper height equal to clear height.
• User must specify stopper height if minimum clearance for vehicles/goods is needed.

4. Material Specification (Clause 6.2)

• Guide channels, brackets, lock plates: Hot-rolled mild steel sheets/plates, thickness ≥ 3.15 mm
• Must conform to IS:5986-1970 (hot-rolled steel plates)

flowchart LR
A[Rolling Shutter Types]
A --> B[Self-Coiling (Manual)]
A --> C[Gear-Operated (Mechanical)]
A --> D[Electrically Operated]

B --> B1[Max Area: 8-12 m²]
C --> C1[Max Area: 25-35 m²]
D --> D1[Max Area: 50 m²]

E[Fixing Positions]
E --> F[Face Fixed]
E --> G[Reveal Fixed]
E --> H[Other Standard Positions]

For exact dimensions and

IS 6248: Types of Rolling Shutters & Applicable Sizes

Types of Rolling Shutters (Clause 5.1)

Clear Opening Dimensions (Clause 3.1.1.1)

• Clear Width: Distance between jambs.
• Clear Height: Distance between sill and soffit (bottom of lintel).
• Recommendation: Round dimensions to nearest 0.2 m for fabrication ease.

Additional Considerations (Clause 5.1)

• Wall or column thickness (for crank/chain operation clearance).
• Surrounding masonry or structural details.
• Nearby beams or sunshades affecting installation.

flowchart TD
    A[Opening Dimensions] --> B[Clear Width (Jamb to Jamb)]
    A --> C[Clear Height (Sill to Soffit)]
    D[Select Shutter Type] --> E[Self-Coiling (≤12 m²)]
    D --> F[Gear-Operated (≤35 m²)]
    D --> G[Electrically Operated (≤50 m²)]
    B & C --> D

This ensures proper shutter selection based on opening size and operation method per IS 6248.

IS 6248: Material Specifications for Components

1. Mild Steel Sections (Clause 6.2)

• Material: Hot-rolled mild steel sheets/plates
• Minimum thickness: 3.15 mm
• Quality: Free from surface defects; edges cleanly sheared
• Reference Standards:
  • IS 5986-1970 (Hot-rolled steel plates and flats)
  • Cold-rolled carbon steel strip specs for general engineering

2. Steel Pipes for Suspension Shaft (Clause 6.3)

• Material: Heavy-duty mild steel pipes
• Standard: IS 1161-1968 (Steel tubes suitable for mechanical purposes)

3. Bracket Plate Sizes (Clause 7.4)

4. Types of Shutters (Clause 4.1)

• Type IA: Inside & above soffit, guide channels overlap jambs inside
• Type IB: Inside & below soffit, roll below soffit inside
• Type OA: Outside & above soffit, guide channels overlap jambs outside
• Type OB: Outside & below soffit, roll below soffit outside
• Type JPB: Jamb projecting & below soffit, roll between jambs below soffit

graph TD
A[Mild Steel Sections] --> B[Hot-rolled sheets/

IS 6248: Fabrication and Construction Details - Key Specifications & Tables

1. Material Specifications (Clause 6.2)

• Mild steel sheets/plates for guide channels, brackets, lock plates:
  • Hot-rolled steel
  • Minimum thickness: 3.15 mm
  • Free from surface defects, edges cleanly sheared
• Refer IS:5986-1970 for steel quality details.

2. Types of Shutters (Clause 4.1 - Table 1)

3. Bracket Plate Size (Clause 7.4 - Table 7.3)

Summary Diagram: Shutter Types Positioning

graph LR
    IA["Type IA: Inside & Above So

IS 6248: Operation of Rolling Shutters — Key Specifications & Formulas

1. Types & Size Limits (Clause 5.1)

2. Operation Details

• Self-Coiling Type (Clause 8.1):
  Raised/lowered manually by pulling hook on bottom lock plate. Hook length must allow full travel to top position.

• Gear-Operated Type:
  Operated via bevel gearbox + crank or chain wheel + hand chain directly on worm shaft.

• Electrically Operated (Clause 8.3):

  • Motor: 3-phase, 400/440 V, 50 Hz AC.
  • Drive: Chain or V-belt or reduction gearbox.
  • Features: Motor removable without affecting operation.
  • Speed limit: ≤ 10 cm/s (curtain movement).
  • Emergency: Control lever to disengage motor and engage manual chain drive.

3. Fixing & Dimensions (Clause 4.1 & Fig. 2)

• Fixing positions and standard designations as per Table 1 and Fig. 2 (not shown here).
• Key dimensions: Outside clear width & clear height of opening govern shutter size.

4. Speed Limitation Formula (for electric type)

[ v \leq 10 \text{ cm/s} ]

where ( v ) = curtain travel speed.

Summary Diagram of Operation Types

graph TD
    A[Rolling Shutters] --> B[Self-Coiling (Manual

Key Specifications & Formulas for Rolling Grills (IS 6248)

• Material & Thickness:

  • Aluminium alloy links (see Clauses 6.7 & 6.8)
  • Cold-rolled steel sheet links: 0.90 mm thickness
  • Mild steel or aluminium alloy round bars: 8 mm diameter

• Design & Function:

  • Similar design and operation as rolling shutters (Clause 9.1)
  • Provides ventilation/visibility with less protection than rolling shutters
  • Link design varies by manufacturer and required safety level (Clause 9.1.1)

• Rolling Shutter-cum-Grill:

  • Grill portion max height: 0.5 m (top, bottom, or both) for ventilation + safety (Clause 9.2)

• Operation:

  • Emergency mechanical operation via auxiliary chain wheel and hand chain on worm shaft (Clause 8.3.2)

Typical Rolling Grill Curtain Assembly

Conceptual Diagram of Rolling Grill Curtain Assembly

graph LR
A[Roller Tube] --> B[Link Assembly]
B --> C[Aluminium/Steel Links or Bars]
C --> D[Guide Channels]
D --> E[Bottom Rail]

Summary: Rolling grills use thin steel/aluminium links or bars for ventilation and visibility, with design and operation closely aligned with rolling shutters but offering less security. The grill portion in combined shutters is limited to 0.5 m height.

IS 6248: Marking and Identification of Rolling Shutters

Key Specifications (Clause 12.1 & 12.1.1)

• Each shutter must be clearly marked with:
  • Manufacturer’s name or trade-mark
  • Year of manufacture
• Optional: Standard Mark can be applied, indicating compliance with BIS quality and inspection norms.

Purpose of Marking

• Ensures traceability and quality assurance.
• Assures purchaser of compliance with IS standards.

Related Painting Specifications

• Use ready mixed paint, brushing, red lead, non-setting, priming as per relevant IS codes.
• Follow Code of Practice for Painting of Ferrous Metals in Buildings (Parts I & II) for pretreatment and painting.

Purchaser’s Information (Appendix A)

• Purchaser must provide detailed order info including shutter type, dimensions, and finishes.

Shutter Types (Clause 4.1 Table Summary)

flowchart LR
    A[Manufacturer] --> B[Mark shutter with name & year]
    B --> C{Use Standard Mark?}
    C -->|Yes| D[Apply BIS Standard Mark]
    C -->|No| E[No Standard Mark]
    D & E --> F[Shutter delivery]
    F --> G[Quality assurance & traceability]

Summary: Markings ensure product traceability and quality compliance. Always specify shutter type and painting details when ordering. Use BIS Standard Mark for assured conformity.

IS 6248 - Packing and Dispatch Key Points

Packing (Clause 11.1)

• Curtain & Bottom Lock Plate: Interlocked and rolled as one piece, wire bound.
• Other Parts: Guide channels, brackets, rollers dispatched separately.
• Small Parts: Bolts, nuts, rivets, keys, screws packed in bundles.
• Optional Crating: For protection against scratches and safe transit, as per purchaser's option.

Material Specification (Clause 6.2)

• Mild Steel Sections: Hot-rolled steel sheets/plates, thickness ≥ 3.15 mm, free from defects (ref: IS 5986-1970).

Dispatch Information (Clause 7.10)

• Purchaser must specify:
  • Type of shutter (see Table 1)
  • Special/optional features if any.

Gear Operation (Clause 8.2.1)

• Gearbox height: ~0.85 m from floor.
• Crank handles detachable; operation possible from both sides.
• Hand chain length: hangs ~0.85 m from floor.
• Gear reduction ensures max pull on handle/chain ≤ 16 kg.

Summary Table for Packing

This ensures safe handling, prevents damage, and meets purchaser requirements per IS 6248.

IS 6248: Marking Requirements for Rolling Shutters (Clause 12.1 & 12.1.1)

Each shutter must be clearly and legibly marked with:

• Manufacturer's name or trade-mark
• Year of manufacture

Optionally, the shutter may carry the BIS Standard Mark, indicating compliance with BIS quality and inspection norms.

Additional Specifications:

• Painting: Use ready mixed paint, brushing, red lead, non-setting priming as per BIS codes of practice for ferrous metals (Part I: Pretreatment, Part II: Painting).
• Bracket Plate Sizes (Clause 7.4):

Summary Diagram of Marking:

graph TD
A[Shutter] --> B[Manufacturer's Name/Trade-mark]
A --> C[Year of Manufacture]
A --> D{Optional}
D --> E[Standard Mark (BIS)]

This ensures traceability, quality assurance, and compliance with IS 6248.

IS 6248 - Information to be Supplied by Purchaser (Clause 7.10 & Appendix A)

When placing an order for shutters, the purchaser must provide the following key information to the manufacturer/supplier:

• Type of shutter: Self-coiling, gear-operated, or electrically operated (Clause 5.1e)
• Construction details around the opening: Brick masonry, stone masonry, concrete, or structural steel (Clause 5.1f)
• Presence of beams, sunshades, etc., near the opening: Orientation and clearance details (Clause 5.1s)
• Wall or column thickness: Important for gear-operated shutters needing crank or chain gear operation from inside/outside (Clause 5.1h)
• Special or optional features: Any additional requirements (Clause 7.10j)

This ensures proper design, manufacture, and installation per IS 6248 standards.

Summary Table: Information to be Supplied by Purchaser

Note: The shutter may also bear the BIS Standard Mark, ensuring compliance with quality and inspection norms (Clause 12.1.1).

flowchart TD
    A[Purchaser] --> B[Provide Type of Shutter]
    A --> C[Provide Construction Details]
    A --> D[Provide Nearby Obstructions & Clearances]
    A --> E[Provide Wall/Column Thickness]
    A --> F[Specify Special Features]
    B & C & D & E & F --> G[Manufacturer Designs Shutter per IS 6248]

For detailed specifications or clarifications, contact the BIS regional offices listed in the standard.