Specification for fanlight pivots

IS 1837 - Scope Summary with Key Tables & Specifications

1. Scope Overview

• Covers fanlight pivots used in ventilator shutters.
• Specifies materials, dimensions, marking, and sampling criteria.
• Emphasizes conservation of non-ferrous materials for indigenous use.

2. Material Requirements (Table 1)

3. Dimensions of Fanlight Pivots

• Type 1 (Table 2) & Types 2 & 3 (Table 3) specify dimensions A to H (in mm) for different designations.
• Thickness of ventilator shutter varies from 25mm to 35mm depending on designation.

4. Marking (Clause 6.1)

• Each pivot must have manufacturer's name or trademark permanently marked.

5. Sampling & Permissible Defects (Clause 8.1, Table 4)

IS 1837: Fanlight Pivots — Key Specifications

Types of Fanlight Pivots

• Type 1 and Types 2 & 3 pivots are specified with dimensions in Tables 2 and 3 respectively, along with Fig. 1 illustration.
• Dimensions (all in mm) include parameters A, B, C, D (Dia), E, F (Dia), G, H (Dia) for different designation numbers.

Table Summary (Dimensions for Thickness of Ventilator Shutter)

| Types 2 & 3 (Table 3) | | | | | | | | | | | 1 | 20.0±0.5| 50.0±0.5| 3.0±0.1 | 9.5±0.2 | 10.0±0.2| 10

IS 1837: Materials for Fanlight Pivots

Key Material Requirements (Table 1, Clause 3.1)

Additional Notes

• Manufacturer's name/trademark must be permanently marked on each pivot (Clause 6.1).
• Material certificates confirming compliance with IS standards must be provided (Clause 8.4.1).
• Non-ferrous materials (copper, zinc alloys) are discouraged for indigenous use due to scarcity but allowed for export.

Bend Test Criterion for Mild Steel

• The test piece must be bent cold until the internal radius equals the thickness or diameter without cracking.

Typical Fanlight Pivot Dimensions (Table 2, Clause 4.1)

IS 1837 - Key Dimensions for Fanlight Pivots

Dimensions of Fanlight Pivots (All in mm)

IS 1837 - Workmanship and Finish for Fanlight Pivots

Key Specifications (Clause 5 & 8.3)

• Inspection: All pivots must meet dimensional (Clause 4) and workmanship/finish requirements.
• Defective pivots: Any pivot failing these is rejected.

Finish Types (Clause 5.2)

Material Requirements (Table 1, Clause 3.1)

Marking (Clause 6.1)

• Manufacturer's name or trademark must be clearly and permanently marked on each pivot.

Typical Dimensions for Type 1 Fanlight Pivots (Table 2, mm)

IS 1837 - Marking of Fanlight Pivots

Key Specifications (Clause 6.1 & 6.2)

• Manufacturer's name or trade-mark must be clearly and permanently marked on each fanlight pivot.
• Optionally, the ISI Certification Mark may be applied, indicating compliance with Indian Standards under ISI supervision.

Material Requirements (Table 1, Clause 3.1)

Dimensions of Fanlight Pivots (Tables 2 & 3, Clause 4.1)

• Dimensions A to H and diameters (D, F, H) vary by designation number.
• Thickness of ventilator shutter ranges from 25 mm to 35 mm depending on pivot size.

IS 1837: Packing, Sampling & Specifications for Fanlight Pivots

Packing (Clause 7.1)

• Type 1 & 3 pivots: Wrapped in paper.
• Type 2 pivots: Wrapped in tissue paper or polythene film.
• Packing as per trade practice.

Sampling (Clause 8.1 & 8.2.1)

• Lot: All pivots of same type, designation & material grouped.
• Sample size based on lot size (Table 4):

• Random sampling from at least 10% packages, minimum 3 packages.

Marking (Clause 6.1)

• Each pivot must have manufacturer's name or trademark permanently marked.

Material Requirements (Table 1)

Dimensions (Table 2 - Type 1 Pivots, mm)

| No. | A | B | C | D Dia | E | F Dia | G | H Dia | Thickness of Ventilator Shutter | |------|------

IS 1837: Sampling and Criteria for Conformity

Key Specifications:

• Lot Definition (8.1): All fanlight pivots of the same type, designation, and material in a consignment form one lot.

• Sample Size (8.2 & Table 4): Depends on lot size.

• Sampling Method (8.2.1): Random selection from at least 10% of packages, minimum 3 packages, equal pivots from each.

• Conformity Criteria (8.4): Lot conforms if defective pivots ≤ permissible number; else rejected.

• Certification (8.4.1): Manufacturer must provide compliance certificate per relevant Indian Standards.

Summary Diagram:

flowchart TD
    A[Consignment] --> B[Group into Lot]
    B --> C[Select Random Samples]
    C --> D{Defective Pivots ≤ Permissible?}
    D -- Yes --> E[Lot Accepted]
    D -- No --> F[Lot Rejected]
    E --> G[Certificate of Compliance Provided]

This ensures quality control by statistically verifying pivot conformity before acceptance.