The main difference between an ERV and an HRV is the _____.

a. way the heat exchanger core works
b. size of the exhaust fans
c. type of economizer used
d. number of heat exchangers


a. way the heat exchanger core works

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What's the advantage of atmospheric gas (argon/carbon dioxide/nitrogen) over halogenated gases for fire suppression in a computer room?

A) Uses less gas per volume of space. B) Has zero ODP and GWP. C) Is much more effective at deep seated fires.

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According to the author, one of the ways in which sustainable construction is different from conventional building is ________

Fill in the blank(s) with correct word

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To determine if a product or substance being used is hazardous, consult ________

A) SAE standards B) A dictionary C) An MSDS D) EPA guidelines

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An 8-foot tall vertical stack of firewood casts a 12-foot shadow on horizontal ground. What is the angle of the sun in the horizon?

a. 8° b. 12° c. 45° d. 34°

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