The venturi throat size has a direct relationship with cleaning efficiency and operating costs:

Smaller throat:

Higher gas velocity and turbulence
Better particle collection, especially for tiny particles
Greater pressure drop
Higher energy/operating costs
Risk of erosion from high velocities
Larger throat:

Lower gas velocity
Reduced collection efficiency
Lower pressure drop
Lower energy consumption
Less wear on equipment
The optimal throat size is typically a compromise between required removal efficiency and allowable energy costs. The relationship follows an exponential curve - doubling throat velocity increases particle collection efficiency but requires four times more energy due to the increased pressure drop.

Would you like me to provide specific numbers for typical throat velocities and their corresponding collection efficiencies?