There are many methods of insulating metal ductwork. Which of the following methods is NOT used to insulate ducts?
A) Spray-on urethane foam B) Fiberglass outerwrap with vapor barrier
C) Fiberglass liner D) Bubble outer wrap or liner
A
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The location and levelness of concrete forms are established by using _____.
a. azimuth stakes b. control centers c. elevation posts d. control points
For the power system in Fig. 11.67, find: (a) the average power, (b) the reactive power, (c) the power factor. Note that 440 V is an rms value.
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Which of the following are common practice for services installed in vertical chases? Select all that apply.
A) Installing valves on piping runouts from chase to floors. B) Installing fire dampers in ducts runout. C) Providing access platforms for routine maintenance. D) Using chase walls as supply ducts.
Which of the following are composed of a continuous core of rigid foam insulation laminated between two layers of structural board with an adhesive to form a single solid pane?
A. structural insulated panels B. oriented strand boards C. expanded polystyrene boards D. steel studs