Draft SS 553:2025
Code of practice for air-conditioning and mechanical ventilation in buildings (Revision of SS 553:2016+A2:2021)
OVERVIEW
This standard specifies requirements for the design, construction, installation, testing and commissioning, operation and maintenance of air-conditioning and mechanical ventilation systems in:
? commercial, office and institutional buildings;
? retail clinics located within commercial buildings.
It does not cover hospitals, cleanrooms and laboratories.
It also defines the basic requirements for mechanical ventilation and air-conditioning engineering practices such that an acceptable indoor thermal environment can be attained in an energy efficient manner while ensuring the indoor air quality and maintenance of the equipment.
The changes in this revision include:
? raising the design of outdoor air conditions based on the latest climate data projections in Singapore.
? specifying minimum outdoor air supply rates for more occupancy types, including area- and per-person values, and how demand-controlled ventilation is used.
? updating the design of indoor dry-bulb temperature and relative humidity range for comfort air-conditioning and maximum air speed for sedentary occupants.
? introducing allowances for elevated air speeds to provide thermal comfort more sustainably.
? raising air filter requirements to reflect true air filtration efficiency standards.
? adding new recommendations on ACMV operations during haze and heightened infectious aerosol risks (e.g. pandemics), and air-cleaning systems used to manage kitchen exhaust.
This standard is intended to complement SS 554 ‘Code of practice for indoor air quality for airconditioned buildings.
Users of the standard includes engineers, architects, building owners, consultants, manufacturers, facility managers, and relevant government agencies.
COMMENTS
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PRODUCT DETAILS
| Status | Draft |
|---|---|
| Edition | 2025 |
| No. of Pages | 101 |
| ICS Classification | |
| Committee | |
| Available for Purchase | For sale in Singapore only |
| Adoption | - |