Specification for aluminium doors, windows and ventilators

IS 1948: Scope - Key Specifications & Tables Summary

Scope:
Covers dimensions, fabrication, and glazing sizes for aluminium doors, windows, and ventilators.

Key Specifications:

• Overall Dimensions:

  • Heights and widths are to the outside of aluminium frames.
  • Allow 1.25 cm clearance on all four sides for fitting into modular openings (Clause 4.1.1).

• Fabrication:

  • All radii R = 1.6 mm (Clause 1.6).
  • Weights of sections per meter are nominal.

• Modular Sizes:

  • Doors and windows are modular, height indicated by number of modules (each module ~117.5 cm height).
  • Doors and side-lights coupled with 117.5 cm high windows (Clause 117.5).

Glass Sizes (Clearance Allowed):

Refer to Clause 47.5 tables for detailed glazing bar types and sizes.

Diagram: Clearance Allowance for Frame Installation

flowchart LR
    A[Modular Opening] -->|1.25 cm clearance each side| B[Aluminium Frame]
    B --> C[Overall Height & Width]
    C --> D[Door/Window/Ventilator Fit]

Summary:
IS 1948 defines aluminium door/window sizes based on modular openings with standard clearances, specifies fabrication radii, and provides detailed glass size tables for different glazing bar types (fixed, centre-hung, side-hung, top-hung

IS 1948: Definitions and Terminology - Key Points

• Overall Dimensions (Clause 4.1.1):

  • Heights and widths are measured to the outside of aluminium frames.
  • Sizes include a clearance allowance of 1.25 cm on all sides for fitting into modular openings.

• Component Definitions (Clause 2.1):

  • Doors, windows, and ventilators components are defined as per Fig. 1 (not shown here), covering sills, rails, glazing bars, etc.

• Fabrication Notes (Clause 1.6):

  • All radii R = 1.6 mm for extruded aluminium sections.
  • Weights per meter length are nominal.

• Glass Sizes and Clearances (Clause 47.5 & Table I):

  • Standard glass sizes are tabulated for different glazing bar types (Fixed, Centre-Hung, Side-Hung, Top-Hung).
  • Glass sizes are in cm (Width × Height) with clearance allowances.
  • Designations like 6NC6, 10NF9, 15HF12 correspond to specific glass sizes and quantities.

Summary Table Extract (Example)

Key Formula for Clearances:

[ \text{Opening Size} = \text{Frame Size} + 2 \times 1.25 \text{ cm (clearance)} ]

Conceptual Diagram (Simplified):

flowchart LR
  A[Modular Opening] -->|Clearance 1.25 cm all sides| B[Frame Size]
  B --> C[Glass Size]
  C

IS 1948: Handing of Doors and Windows – Key Points

1. Dimensions (Clause 4.1.1 & Fig. 4)

• Overall heights and widths are measured outside the aluminium frame.
• Allow 1.25 cm clearance on all four sides for fitting into modular openings.
• Sizes relate to modular openings (height indicated by number of modules).

2. Handing of Doors and Windows (Clause 3.1 & Fig. 2)

• Right-hand or Left-hand based on hinge side when viewed from inside.
• Side-hung doors/windows are classified accordingly:
  • Right-hand: Hinged on right.
  • Left-hand: Hinged on left.

3. Glass Sizes (Table I)

• Glass sizes are standardized for various types (fixed, centre-hung, side-hung, top-hung).
• Clearances are allowed per clause 5.3.
• Sizes given in cm, e.g., 53.0 x 83.0 cm for 6NF9 designation.

4. Fabrication Notes (Clause 1.6)

• Radii of corners: R = 1.6 mm.
• Section weights are nominal per meter.

Summary Table: Door/Window Handing

Diagram: Handing Concept

flowchart LR
    A[Inside View] --> B{Hinge Side?}
    B -->|Right| C[Right-hand door/window]
    B -->|Left| D[Left-hand door/window]

Use these guidelines for specifying aluminium door/window handing and sizes per IS 1948.

IS 1948: Standard Sizes, Tolerances & Designations Summary

1. Standard Sizes:

• Aluminium extruded sections for doors, windows, and ventilators are dimensioned in mm.
• Glass sizes for various designations are tabulated with clearances allowed (width × height in cm).
• Designations include types like No Glazing Bar Fixed, Bar Centre-Hung, Side-Hung, Top-Hung, and Horizontal Glazing Bar types.
• Typical glass sizes range from 42.5 cm to 113 cm in width and height depending on type and designation.

2. Tolerances (Clause 4.2):

• Frame sizes (doors/windows/ventilators) tolerance:
  ± 1.5 mm maximum variation allowed.

3. Radii:

• All corner radii for aluminium sections are standardized at R = 1.6 mm.

Key Table Extract (Glass Sizes Example)

Summary Diagram: Door/Window Frame Tolerances

flowchart LR
    A[Specified Frame Size] --> B{Tolerance ±1.5 mm}
    B --> C[Minimum Size = Specified - 1.5 mm]
    B --> D[Maximum Size = Specified + 1.5 mm]

Use these standard sizes and tolerances to ensure compliance with IS 1948 for aluminium door/window fabrication.

IS 1948 - Materials and Sections: Key Points

1. Materials:

• Aluminium alloy sections conform to IS:1285-1958 (HV9-WP) for extruded round tubes and hollow sections.
• Alloy temper: Typically Al-T6 or similar for strength and durability.

2. Section Dimensions & Weights (Clause 5.1.2 & Fig. 5):

• Dimensions in mm.
• Weights are nominal per metre length.
• Typical section weights include:

  Section Type	Weight (kg/m)
  Glazing Bar AL-T6	0.306
  Glazing Bar AL-T7	0.334
  Glazing Bar AL-T8	0.363
  Mullion Bar AI-F4B	0.837
  Opening Frame AI-CF6	0.614
  Inside Frame AI-HFX5/6	0.73
  Inside Frame Bar AL-FX5/6	1.033
  Ventilator Bar AL-F5	0.614
  Outside Frame AL-FX8	0.805
  Outer Bar for Ventilator AL-F8	0.63

3. Fabrication Notes (Clause 1.6):

• All radii R = 1.6 mm.
• Dimensions and weights per metre are nominal.

4. Glass Sizes & Clearances (Table I):

• Glass sizes vary by designation (e.g., 6NF6, 10NF6) with specific width × height in cm.
• Clearances allowed per clause 5.3.
• Types include fixed, centre-hung, side-hung, and top-hung glazing bars.

Summary Diagram: Aluminium Section Weight Hierarchy

graph TD
    A[Aluminium Sections] --> B[Glazing Bars]
    A --> C[Mullion Bars]
    A --> D[Frames]
    B --> B1[AL-T6 (0.306 kg/m)]
    B --> B2[AL-T7 (0.334 kg/m)]
    B -->

IS 1948: Fabrication Key Points

1. Radii & Weights

• All radii (R) = 1.6 mm (Clause 1.6, Note 1)
• Weights of sections per meter are nominal (Clause 1.6, Note 2)

2. Aluminium Section Weights (kg/m)

3. Glass Sizes & Clearances

• Detailed glass sizes and clearance allowances are tabulated for different glazing bar types (Fixed, Centre-Hung, Side-Hung, Top-Hung).
• Sizes are given in cm (Width x Height).
• Refer to TABLE I GLASS SIZES for exact dimensions per designation (e.g., 6NF6, 10NF9, 15HS12, etc.).

4. Fabrication Details Location

• Locations of door, window, and ventilator parts for fabrication are shown in Fig. 6 (Clause 6.1.1).

Summary:

• Use R = 1.6 mm for all bends.
• Refer to weights per meter for material estimation.
• Select glass sizes and clearances as per TABLE I.
• Follow detailed fabrication layouts in Fig. 6 for assembly.

flowchart LR
    A[Aluminium Sections] --> B{Type}
    B --> C[Glazing Bars (T6, T7, T8)]
    B --> D[Mullion Bars (F4B)]
    B --> E

IS 1948 Key Specifications: Position of Bolts, Fixing Screws & Lugs

1. Position of Fixing Holes (Clause 7.1)

• Fixing holes should be centrally located in the web of the outer frame sections (see Fig. 31).
• Steel lugs contacting aluminum must be galvanized or bituminous painted.

2. Fixing Screws & Lugs (Clause 7.2, Table II)

3. Additional Fixing Details

• Slotted steel adjustable lugs: Natural finish, minimum dimensions 100 x 16 x 3 mm.
• Fixing screws for wooden frames: Refer Fig. 32.
• Fixing clips for steel work: Refer Fig. 34.
• Glazing clips: Refer Fig. 35.

Diagram: Fixing Hole Position (Simplified)

graph LR
A[Outer Frame Section] --> B[Web]
B --> C[Fixing Hole (Central)]

Note: All dimensions for screws and lugs are in millimeters except Table II which lists dimensions in cm for lugs.

IS 1948: Surface Protection for Aluminium Doors, Windows, and Ventilators

Key Specification (Clause 8.2)

• Protective Coating:
  Apply a thick layer of clear transparent lacquer (methacrylates or cellulose butyrate based) by suppliers before installation.
• Purpose:
  Protect aluminium surfaces from wet cement damage during installation.
• Removal:
  Lacquer coating must be removed after installation is completed.

Additional Relevant Notes

• Radii for Sections: All radii R = 1.6 mm (Clause 1.6).
• Weights: Section weights per meter are nominal.
• Fixing Screws & Lugs (Clause 9.1 & Table II):
  For fixing aluminium frames, use galvanized screws/lugs as per substrate:

  Place of Fixing	Screw/Lug Size
  Wooden frames (rebated)	30 mm × No. 10 galvanized wood screws
  Concrete/brick (rebated)	Same as above
  Concrete/brick (plain jambs)	45 mm × No. 10 galvanized wood screws
  Direct to masonry	Slotted steel adjustable lugs 100×16×3 mm with galvanized bolts/nuts

Summary Diagram: Surface Protection Process

flowchart TD
    A[Aluminium Doors/Windows] --> B[Apply Clear Lacquer Coating]
    B --> C[Installation Process]
    C --> D[Remove Lacquer Coating]
    D --> E[Finish - Protected Surface]

Use this lacquer coating method to ensure aluminium elements remain undamaged by wet cement during construction, complying with IS 1948 Clause 8.2.

IS 1948 - Key Specifications & Tables for Glazing

1. Glass Panes (Clause 5.3)

• Weight: Minimum 7.5 kg/m².
• Quality: Free from flaws, specks, bubbles; corners squared, edges straight.
• Size Specification: Width × Height (cm) as per Table I (unified with building industry practice).

2. Glass Sizes (Table I - Clause 1.6 & 47.5)

• Glass sizes standardized for various glazing bar types:
  • No Glazing Bar
  • Glazing Bar Fixed
  • Bar Centre-Hung
  • Bar Side-Hung
  • Bar Top-Hung
• Sizes range typically from 42.5 cm to 113 cm in width and height.
• Clearance allowed for fitting is specified in the table.

3. Glazing Location (Clause 9.1)

• Glazing must be installed on the outside of the frame.

4. Fixing Screws and Lugs (Table II - Clause 7.2)

Summary Diagram: Glazing Installation

flowchart TD
    A[Glass Pane] -->|Fixed on Outside| B(Frame)
    B --> C{Type of Frame}
    C -->|Wooden Rebate| D[30 mm No.10 Wood Screws]
    C -->|Concrete/Stone Rebate| D
    C -->|Concrete/Stone No Rebate| E[45 mm No.10 Wood Screws]
    C -->|Brick/Masonry or Steel| F[Slotted Steel Lugs + Screws]

For detailed glass sizes and quantities, refer to Table I Glass Sizes in IS 1948 Clause 1

IS 1948: Dispatch and Packaging Key Points

Dispatch Specifications:

• Clause 10.1: Doors, windows, and ventilators must be dispatched with opening parts secured to maintain alignment during fixing and glazing.
• Clause 10.2: Fixing lugs, coupling fittings, and all hardware shall be dispatched separately.

Packaging Notes:

• All sections have a nominal weight per meter (see fabrication tables).
• Radii for corners are standardized at R = 1.6 mm for extruded aluminum sections.

Important Tables for Glass Sizes (Clause 47.5)

Clearance allowances are specified per Clause 5.3.

Summary Diagram: Dispatch Process

flowchart LR
    A[Fabrication Complete] --> B[Secure Opening Parts]
    B --> C[Package Sections]
    C --> D[Dispatch Hardware Separately]
    D --> E[Delivery to Site]

In brief:

• Secure movable parts before dispatch.
• Dispatch hardware separately.
• Use standard glass sizes and glazing bar types as per tables.
• Follow nominal weights and radii specifications for packaging and handling.

IS 1948 - Marking Specifications Summary

Clause 11.1 & 11.1.1: Marking Requirements

• Marking on Frames:
  All doors, windows, and ventilators must be marked on their frames with:

  • Manufacturer's identification
  • Type of unit

• ISI Certification Mark:

  • Optional marking governed by the Indian Standards Institution (Certification Marks) Act.
  • Indicates compliance with IS standards, quality control, and continuous inspection by ISI.
  • Licensing details available from BIS.

Key Points on Marking:

Additional Notes:

• BIS controls all standards and publication copyrights.
• For licensing and use of ISI mark, contact BIS regional offices (e.g., New Delhi, Kolkata, Chennai, Mumbai).
• Marking helps traceability and quality assurance in production and marketing.

If you need glass size tables or fabrication details, refer to IS 1948 Clause 1.6 and Clause 47.5, which provide detailed dimensions and glazing bar types for aluminum sections.

flowchart TD
    A[Doors, Windows, Ventilators] --> B[Frame Marking]
    B --> C{Marking Content}
    C --> D[Manufacturer ID]
    C --> E[Unit Type]
    B --> F[Optional ISI Certification Mark]
    F --> G[License from BIS]
    G --> H[Quality Assurance & Inspection]

For detailed glass sizes and fabrication, consult IS 1948 Tables under Clauses 1.6 and 47.5.