Figure 1. Comparison of locations for exhast fans and air inlets.

Makeup Air Fan through Plenum behind worker and exhaust fan in front of worker pushing exhaust out.

BEST air inlet    BEST exhaust

Makeup Air Fan above and behind worker, pushing air down low, and exhaust fan in front of worker pushing exhaust out.

BETTER air inlet     BEST exhaust

Makeup Air Fan through Plenum above worker and exhaust fan in front of worker pushing exhaust out.

BEST air inlet    BEST exhaust

Makeup air opening behind worker, exhaust fan in front of worker pushing exhaust out.

FAIR air inlet    BEST exhaust

Makeup Air opening towards worker; exhaust fan above worker.

POOR air inlet    POOR exhaust

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