BS 4856-4:1997

This standard BS 4856-4:1997 Methods for testing and rating fan coil units, unit heaters and unit coolers is classified in these ICS categories:

• 91.140.30 Ventilation and air-conditioning systems
• 97.100.01 Heating appliances in general
• 17.140.20 Noise emitted by machines and equipment

This British Standard establishes general rules for acoustic testing of fan coil units, unit heaters and unit coolers, in order to determine sound power levels. This standard is applicable to equipment operating under steady state conditions. It applies to sources that produce steady broad-band noise, and to sources that may produce significant discrete frequency components or narrow band noises.