Minimum Particle Size Diameter (\( d_{min} \)):

\[ d_{min} = \sqrt{\frac{18 H V \mu}{\rho_p g L}} \]

Where:

• \( d_{min} \) is the particle size that can be retained, in meters (m).
• \( H \) is the height of the chamber, in meters (m).
• \( V \) is the gas velocity, in meters per second (m/s).
• \( \mu \) is the viscosity, in kilograms per meter-second (kg/m-s).
• \( \rho_p \) is the particle density, in kilograms per cubic meter (kg/m³).
• \( g \) is the gravitational acceleration (9.81 m/s²).
• \( L \) is the length of the chamber, in meters (m).