Ventilation systems designed for office buildings may recirculate most of the air and only supply a small percentage of fresh air, but architectural and building codes require that laboratory rooms and vivaria use only fresh outside air for ventilation. This design difference explains why laboratories require so much more energy to operate.
from Odor Management Plan in Controlling Smoke Odor http://bit.ly/2GzR5lP
via http://bit.ly/2R7558e
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