The specification outlines the criteria for ventilator chains primarily designed to secure bottom-hung ventilators in a partially open state, even under strong winds. It details the necessary materials, dimensions, structural design, testing methods, marking protocols, and quality assurance procedures to guarantee dependable performance and longevity. This standard is crucial for manufacturers, distributors, and engineers involved in ventilation hardware and related construction components.
Overview
The specification outlines the criteria for ventilator chains primarily designed to secure bottom-hung ventilators in a partially open state, even under strong winds. It details the necessary materials, dimensions, structural design, testing methods, marking protocols, and quality assurance procedures to guarantee dependable performance and longevity. This standard is crucial for manufacturers, distributors, and engineers involved in ventilation hardware and related construction components.
Audience
Contents
Structure
This section defines the standard’s coverage concerning ventilator chains, emphasizing material and manufacturing compliance. It also describes sampling requirements and quality certifications needed to ensure adherence to established norms.
Clarifies definitions related to ventilator chains, specifies material grades for components such as staples, eyes, and wire, and outlines the use of SI units for measurement and testing.
Details the specific materials and IS grades required for each component of the ventilator chain, including minimum thicknesses and certification responsibilities of manufacturers.
Describes construction details including the materials used, staple specifications, and the necessary physical characteristics to meet the standard requirements.
Specifies dimensional values and tolerances for chain components with reference to illustrative diagrams, highlighting customization options upon mutual agreement.
Outlines strength requisites for ventilator chains, including material grades, minimum staple thickness, and the testing procedures to verify structural integrity.
Covers the finishing processes such as corrosion protection, ensuring components are free from defects like burrs, and adherence to thickness and fixing hole standards.
Specifies the requirements for marking ventilator chains with the ISI mark and manufacturers’ identification for quality assurance and product traceability.
Details sampling sizes correlated to lot sizes, the inspection methodology, acceptance criteria for defects, and the requirement for certificates of compliance.
Defines the criteria for lot acceptance based on permissible defective counts in sampled chains, ensuring consistent compliance with the standard.
Frequently Asked
IS 3828 does not explicitly define minimum thickness or wire diameter values for ventilator chains within the provided clauses. The standard specifies use of mild steel or aluminium alloy materials in certain grades, such as Grade 0 of IS 1079-1957 for steel and SIC 1/2-H or NS3-1/2 H of IS 737-1955 for aluminium alloy. Typically, wire diameters for ventilator chains range between 1.6 mm to 3.0 mm depending on load demands. For precise dimensions, manufacturers’ specifications or load-based design calculations should be consulted.
To conform with ISI Certification Mark requirements as per IS 3828 Clause 8.1.1, each ventilator chain must display the ISI mark indicating compliance with inspection and quality standards. The manufacturer’s name or trademark should be clearly and legibly marked on the staple or eye plate. Use of the ISI mark requires a valid license from the Indian Standards Institution, and it guarantees ongoing monitoring of product conformity.
According to IS 3828 Clause 6.1, the ventilator chain assembly, including the eye, chain, and staple, must endure a load of 20 kilograms (approximately 196 Newtons) without exhibiting any visible deformation. This ensures the assembly’s strength and operational reliability.
IS 3828 specifies that sampling size is dependent on lot size, as outlined in Table 2. Samples are randomly drawn from at least 10% of packages, with a minimum of three packages represented evenly. The permissible number of defective chains varies with lot size. Lots exceeding the allowed number of defects are rejected. Manufacturers must also provide a certificate of compliance verifying conformity with applicable Indian Standards.
IS 3828 covers ventilator chains designed specifically for bottom-hung ventilators where the sash is supported from below. It does not explicitly address chains intended for top-hung ventilators. Using IS 3828 chains for top-hung types is not advised without special design considerations, as load orientations differ. For top-hung ventilators, purpose-built chains or stay arms should be employed.
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