Filtration in central vacuum systems shall be sized for what percent of peak calculated demand while one is isolated?

Filtration in central vacuum systems shall be sized for what percent of peak calculated demand while one is isolated?

• A. 50%
• B. 100%
• C. 150%
• D. 200%

Answer: (B)

Sizing the filtration to the peak calculated demand in the scenario where one branch is isolated ensures the vacuum system can maintain adequate suction and protect the pump and downstream filters during the highest expected load. When a line is shut off, the remaining network can still present near-peak airflow demands, so filtration must be able to handle that full demand. If the filter were undersized (for example 50%), the system could experience excessive pressure drop, reduced suction at outlets, or increased wear on the pump. Oversizing beyond 100% doesn’t provide real benefit in this context and adds unnecessary cost. Therefore, filtration is sized to 100% of the peak calculated demand when one line is isolated.

Sizing the filtration to the peak calculated demand in the scenario where one branch is isolated ensures the vacuum system can maintain adequate suction and protect the pump and downstream filters during the highest expected load. When a line is shut off, the remaining network can still present near-peak airflow demands, so filtration must be able to handle that full demand. If the filter were undersized (for example 50%), the system could experience excessive pressure drop, reduced suction at outlets, or increased wear on the pump. Oversizing beyond 100% doesn’t provide real benefit in this context and adds unnecessary cost. Therefore, filtration is sized to 100% of the peak calculated demand when one line is isolated.