What is a fanlight catch used for?

It is a specific builder's hardware item designed to securely hold top-hung ventilators (fanlights) in a closed position.

What materials are permitted for manufacturing fanlight catches?

The standard allows the use of cast brass, extruded brass sheet, aluminium alloy, and mild steel, depending on the required grade and application.

How should mild steel fanlight catches be finished?

They must be properly treated to resist corrosion, typically through stove enamelling, zinc plating, or copper oxidation.

IS 364

: 1993

Fanlight Catch -Specification

CurrentSpecializedSpecificationArchitectural · Builder Hardware

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IS 364 specifies the requirements for materials, dimensions, manufacture, and finish of fanlight catches. Engineers and architects use this code to ensure quality standardisation of builders' hardware primarily used for securing top-hung ventilators or fanlights.

Fanlight Catch -Specification

Quick Reference Values

Material optionsBrass, aluminium alloy, or mild steel

Manufacturing requirementMust be free from defects, sharp edges, and burrs

Screw holes configurationCountersunk suitably to accommodate standard wood screws

Protective finish (Mild Steel)Stove enamelled, copper oxidized, or zinc plated to prevent corrosion

Practical Notes

Select the material based on environmental exposure; use brass or anodized aluminium in damp or coastal areas to prevent corrosion.

Ensure the catch and striking plate are aligned perfectly during installation to ensure smooth operation and prevent mechanical wear.

Verify the countersinking depth matches the screw heads so they sit perfectly flush with the hardware surface.