Overview
ISO 9943:2009 - Shipbuilding: Ventilation and air‑treatment of galleys and pantries with cooking appliances - defines design requirements and good practice for galley ventilation and air‑treatment on merchant seagoing ships. The standard applies when the shipowner specifies ventilation, and covers normal environmental conditions (excluding extremely cold or hot climates). It focuses on safe, hygienic and comfortable galley operation by specifying supply/exhaust system arrangements, thermal load treatment and airflow calculation methods.
Key topics and technical requirements
- Separate supply and exhaust systems: A dedicated supply air system must provide outdoor air only; a separate exhaust system must discharge galley exhaust to atmosphere.
- Temperature conditioning:
- Cooling capacity: supply air must be cooled to 10 °C below an outdoor condition of 35 °C dry‑bulb / 70% RH (i.e., supply ~25 °C).
- Heating capacity: supply air must be heatable to +20 °C when outdoor is −20 °C.
- Airflow calculation: Supply airflow V is calculated from total heat emission (sensible + latent), air density and enthalpy difference, including a simultaneity factor (L) (minimum 0.5; example values: 1.0 for pantries, 0.8 for galleys ≤250 meals/day, 0.7 for >250).
- Exhaust greater than supply: The exhaust volume shall exceed supply to maintain negative pressure in the galley relative to adjacent accommodation.
- Hoods and extraction: Appliances that generate heat/contaminants (ranges, fryers) should have hood exhausts with grease trays/filters; where hoods are effective, convective and latent loads are removed via exhaust and only radiant heat counts toward room cooling load.
- Installation & maintenance guidance: Recommendations on duct routing, inspection/drain points, fan placement (exhaust motors outside airstream), outdoor air filtration (example: EU‑3), and limiting air velocities to avoid draughts.
- Acoustic limit: Air distribution system sound pressure at 1 m from terminal device should not exceed 75 dB(A).
Practical applications
- Design and sizing of galley HVAC and extraction systems on merchant ships
- Calculating supply/exhaust airflow and thermal loads for galleys and pantries
- Specifying hood design, filtration and ducting for cooking appliances
- Ensuring crew comfort, fire safety mitigation (grease control) and regulatory alignment in ship HVAC contracts
Who should use this standard
- Marine HVAC and shipboard mechanical engineers
- Ship designers, shipbuilders and naval architects
- Shipowners, ship management and procurement teams specifying galley systems
- Marine consultants, classification societies and regulatory authorities
Related standards
- ISO 31‑4 (quantities and units - heat)
- ISO 3258 (air distribution and air diffusion - vocabulary)
Note: ISO 9943:2009 should be applied alongside applicable statutory rules and ship‑specific regulations. Keywords: ISO 9943:2009, galley ventilation, shipbuilding, ship HVAC, galley exhaust, supply airflow, cooking appliance hood.