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IS 6272 : 1971Code of practice for ventilation of residential buildings

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ASHRAE 62.2 · Approved Document F, Volume 1: Dwellings (2021 edition) · EN 16798-1
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OverviewValues5InternationalTablesFAQ4

IS 6272:1971 is the Indian Standard (BIS) for ventilation of residential buildings. This standard provides guidelines for the natural and mechanical ventilation of residential buildings. It specifies minimum requirements for openings, recommends air change rates for various rooms, and outlines principles to ensure adequate air quality and thermal comfort for occupants.

Outlines guidelines for ensuring proper ventilation in residential buildings for comfort and health.

Overview

Status
Current
Usage level
Frequently Used
Domain
Architectural — Building Planning and Design
Type
Code of Practice
International equivalents
ASHRAE 62.2-2022 · ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), USAApproved Document F, Volume 1: Dwellings (2021 edition) · HM Government, United KingdomEN 16798-1:2019 · CEN (European Committee for Standardization), EuropeAS 1668.2:2012 · Standards Australia, Australia
Also on InfraLens for IS 6272
5Key values1Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! While this standard is still active (reaffirmed 2021), many of its provisions are now covered more comprehensively in the National Building Code of India (SP 7), particularly Part 8 - Building Services.
! The code's recommendations for opening sizes are often a starting point, with final design influenced by climate, building orientation, and specific occupant needs.
! Focus is on providing both 'air for health' (fresh air) and 'air for comfort' (air movement), which are distinct objectives.
Frequently referenced clauses
Cl. 3TerminologyCl. 4General Principles of VentilationCl. 5Minimum Requirements for OpeningsCl. 6Ventilation of Specific Areas (Kitchens, Bathrooms)Cl. 7Mechanical Ventilation
Pulled from IS 6272:1971. Browse the full clause & table index below in Tables & Referenced Sections.

International Equivalents

Similar International Standards
ASHRAE 62.2-2022ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), USA
HighCurrent
Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings
Both provide minimum ventilation requirements for residential buildings to ensure occupant health.
Approved Document F, Volume 1: Dwellings (2021 edition)HM Government, United Kingdom
HighCurrent
The Building Regulations 2010: Approved Document F - Ventilation, Volume 1: Dwellings
Both establish standards for ventilation in new and existing residential dwellings, covering natural and mechanical methods.
EN 16798-1:2019CEN (European Committee for Standardization), Europe
MediumCurrent
Energy performance of buildings - Ventilation for buildings - Part 1: Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics
Provides the indoor air quality criteria and ventilation rates that are used to design and assess building systems.
AS 1668.2:2012Standards Australia, Australia
MediumCurrent
The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings
Focuses on mechanical ventilation design and installation, overlapping with IS 6272's provisions for mechanical systems.
Key Differences
≠IS 6272 is highly prescriptive, specifying minimum opening areas as a fraction of floor area (e.g., 1/10th). Modern standards like ASHRAE 62.2 are performance-based, defining required ventilation rates in litres per second (L/s) or cubic feet per minute (cfm).
≠The Indian standard heavily emphasizes natural ventilation through windows and ventilators, reflecting the construction practices and climate of its era. International standards give equal or greater weight to mechanical ventilation, especially in airtight buildings.
≠IS 6272 does not address building airtightness. Modern codes like UK's Approved Document F intrinsically link ventilation requirements to airtightness test results, demanding more robust ventilation strategies for tighter homes.
≠Modern standards mandate specific, quantified local exhaust ventilation rates for kitchens and bathrooms to control moisture and pollutants at the source. IS 6272 recommends exhaust fans but does not specify mandatory flow rates.
≠IS 6272 uses 'air changes per hour' (ACH) as a guideline for comfort. This metric is now considered less reliable by standards like ASHRAE 62.2, which prefer rate-based calculations (e.g., L/s per person + L/s per m²) that are independent of ceiling height.
Key Similarities
≈All standards share the fundamental objective of supplying outdoor air to maintain occupant health, control moisture, and dilute indoor-generated pollutants and odours.
≈Both IS 6272 and its international counterparts identify kitchens and bathrooms as critical areas that require enhanced ventilation due to high generation of moisture and contaminants.
≈The principle of providing cross-ventilation by placing openings on different walls is a key recommendation in IS 6272 for natural ventilation, a strategy also recognized and specified in modern codes like the UK's Approved Document F.
≈All standards, whether through prescriptive area rules or calculated flow rates, implicitly or explicitly link ventilation requirements to the size and occupancy of the dwelling.
Parameter Comparison
ParameterIS ValueInternationalSource
Minimum Natural Ventilation Opening Area1/10th of floor area (for hot-dry climates).4% of the floor area of the room (equivalent to 1/25th).UK Approved Document F, Vol 1
Whole Dwelling Mechanical Ventilation RateNot specified as a single rate. Recommends ACH values for different rooms (e.g., 3-5 ACH for living rooms).Calculated based on floor area and number of bedrooms. E.g., for a 3-bedroom, 100 m² house: ~21 L/s.UK Approved Document F, Vol 1
Whole Dwelling Mechanical Ventilation Rate (Formula)Not based on a formula.(3.5 L/s × No. of occupants) + (0.3 L/s × floor area in m²).ASHRAE 62.2-2022
Kitchen Intermittent Extract Fan RateNo rate specified. Recommends a fan with capacity for ~10-15 ACH.50 L/s (100 cfm) minimum.ASHRAE 62.2-2022
Bathroom Intermittent Extract Fan RateNo rate specified. Recommends a fan with capacity for ~6-10 ACH.25 L/s (50 cfm) minimum.ASHRAE 62.2-2022
Minimum Window Opening in a Bathroom0.2 m² minimum.No minimum size specified; relies on meeting overall natural ventilation area (1/20th of floor area) or using mechanical extract.UK Approved Document F, Vol 1
Humidity ControlAddressed qualitatively through air movement for comfort in wet climates.Addressed quantitatively via specified mechanical exhaust rates in kitchens and bathrooms to remove moisture at the source.ASHRAE 62.2-2022
⚠ Verify details from original standards before use

Key Values5

Quick Reference Values
Minimum aggregate opening area for lighting & ventilation1/10th of the floor area
Minimum clear opening area for ventilation only1/20th of the floor area
Recommended air changes per hour for Kitchens10 to 15
Recommended air changes per hour for Bathrooms/WCs6 to 10
Minimum height of ventilator opening above floor2.1 m

Tables & Referenced Sections

Key Tables
Table 1 - Recommended Air Changes for Different Occupancies
Key Clauses
Clause 3 - Terminology
Clause 4 - General Principles of Ventilation
Clause 5 - Minimum Requirements for Openings
Clause 6 - Ventilation of Specific Areas (Kitchens, Bathrooms)
Clause 7 - Mechanical Ventilation

Frequently Asked Questions4

What is the minimum opening area for a habitable room?+
The aggregate area of openings for both lighting and ventilation should be at least 1/10th of the room's floor area (Clause 5.2).
Does this code cover air conditioning?+
No, this code focuses on natural and mechanical ventilation (fans). Air conditioning is covered in other specialized standards and the National Building Code.
What are the ventilation requirements for a kitchen?+
Kitchens require special attention to remove heat, smoke, and odours, with recommended air change rates of 10-15 per hour, often achieved with exhaust fans (Clause 6.1 and Table 1).
Where should ventilators be located?+
Ventilators should be located near the ceiling, with their bottom not less than 2.1 m from the floor, to effectively remove warm and stale air.

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