Specifications:
The document details the specifications for the WS210 circular swirl diffuser with fixed blades. It includes information on calculating airflow behavior, sound levels, and pressure loss using the FACT selection software.

Sound Power and Pressure Drop:
The document provides data on sound power levels (LW) in both NR and dB(A), and pressure drop (ΔPtot) in Pa for various airflow rates (Qv) measured in m³/h and l/s. The diffuser sizes range from 100 mm to 500 mm.

Air Discharge Velocity and Effective Surface Area:
The effective air discharge surface area (Ak) is provided for different diffuser sizes, ranging from 0.0016 m² to 0.0569 m². The air discharge velocity (Vk) is calculated based on Ak.

Selection Example:
An example selection is provided, detailing the process of choosing a diffuser size based on sound power, pressure drop, and velocity requirements. The example includes:

• Requested max. sound power: 38 dB(A)
• Proposed size: Ø 125 mm
• Total pressure loss: 31 Pa
• Discharge velocity: 8.0 m/s
• Throw distance: 3.4 m

Known Data:
Includes supply air flow rate, supply air temperature, ambient temperature, max allowable sound pressure, room sound attenuation, and max air velocity in the occupied zone.

Legend:
The document provides a legend explaining the symbols used, such as Ak for effective air discharge surface area, LW for sound power, LT0.2 for throw distance, ΔPtot for total pressure loss, Qv for airflow, ΔT for temperature difference, and Vk for air discharge velocity.