Bsria Rules Of Thumb Work Jun 2026

| Plant Item | BSRIA Rule of Thumb (Space % of Gross Floor Area) | Notes | | :--- | :--- | :--- | | | 5% – 7% | Includes chillers, boilers, AHUs, and switchgear. | | Hospitals | 8% – 12% | High redundancy and infection control require more space. | | Retail (HVAC only) | 3% – 5% | Often limited space; requires compact equipment. | | Chiller Room | 0.1 – 0.2 m² per kW cooling | Allow extra for access and pipework bends. | | Boiler Room | 0.05 – 0.1 m² per kW heating | Condensing boilers require more floor area than atmospheric. |

While powerful, these rules have limitations. Do not rely on them for: bsria rules of thumb

Allow 1 m² of plant room floor space for every 1.0 – 1.5 m³/s of air supply. | Plant Item | BSRIA Rule of Thumb

BSRIA offers strict guidance to avoid noisy, inefficient ductwork. | | Chiller Room | 0