Footing drains are usually perforated ____ pipe placed around the footings in a bed of crushed stone.
A. concrete
B. plastic
C. aluminum
D. steel
Answer: B
Trades & Technology
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Where are the drawing number and revision level found?
a. In the zoning coordinate system. b. In the title block. c. In the bill of material d. On the back of the drawing.
Trades & Technology
Why would a preheat coil be used on the energy-recovery wheel?
A) To dry the intake air B) To warm the exhaust air C) To prevent moisture transfer to the supply air D) To prevent frost from forming on the wheel
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The general duty clause of the OSH Act requires that employers provide a workplace that is free from hazards that are likely to harm employees.