Manifolded Exhaust

Energy Efficiency and Manifolded Exhaust

A manifolded exhaust system saves energy because:

·It requires less installed fan power, less duct work, and less electrical wiring than for individual systems,

·It can use multiple fans sized for partial volume so the air flow can be stepped up or down by starting or stopping additional fans,

·Exhaust fans can use Variable Frequency Drives (VFDs) to save fan power and energy depending on how many fume hoods are operating (see "fume hood diversity," Chapter 3),

·Energy recovery opportunities are simplified (refer to Chapter 5), and

·BSCs that are not in use can be isolated from the exhaust manifold.


Overview of manifold exhaust systems

Manifold arrangements

Duct static pressure control

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