Building Bulletin 101 (BB101) and the PSBP Output Specification (2014) establish rigorous standards for ventilation, thermal comfort, and indoor air quality, helping to create healthier learning environments that support the wellbeing, comfort, and academic performance of both students and teachers.
1. BB101: Minimum Flow Rates
Ensuring a constant supply of fresh air is critical for concentration. The following minimums apply:
- Standard Classrooms: Minimum of 3 L/s/person (litres per second, per person).
- Daily Average: Should aim for a higher average of 5 L/s/person
- Maximum Capability: Systems must be capable of providing 8 L/s/person when needed.
- Science Labs: Require a minimum of 5 ACH (Air Changes per Hour).
2. BB101: Maximum CO₂ Limits
Carbon Dioxide levels are measured in ppm (parts per million) and act as a proxy for air freshness.
- Critical Limit: CO₂ must never exceed 5000 ppm.
- Teaching Day Average: Levels should be less than 1500 ppm.
- Ideal Threshold: Occupants should strive to keep levels below 1000 ppm.
3. PSBP FOS (2014) Standards
The Priority School Building Programme (PSBP) Facilities Output Specification (FOS) sets different targets depending on the ventilation type.
Natural Ventilation
- Average CO₂: Must be less than 1500 ppm.
- Upper Limit: CO₂ can be no greater than 2000 ppm for more than 20 minutes in a day.
Mechanical Ventilation
- Average CO₂: Must be less than 1000 ppm.
- Upper Limit: CO₂ can be no greater than 1500 ppm for more than 20 minutes in a day.
4. Updated BB101 Requirements
Recent updates have refined flow rates for specialized rooms:
- Art and ICT (Traditional): Minimum of 5.0 L/s/m².
- Science Laboratories: Must handle a capacity of 10.0 L/s/p or a minimum of .08 L/s/m².
- Safety Alarm: In science labs, an alarm must sound if CO₂ levels reach 2800 ppm.