What is the major problem with using wall cavities for ductwork?
A) air moving through a wall cavity makes a lot of noise
B) Installing registers and grilles on wall spaces used for ducts is difficult
C) Using a wall cavity is generally less convenient than running ductwork
D) It is nearly impossible to make the cavity air tight
Question 2
There are many methods of insulating metal ductwork. Which of the following methods is NOT used to insulate ducts
A) Bubble outer wrap or liner B) Fiberglass liner
C) Spray on urethane foam D) Fiberglass outerwrap with vapor barrier
Major trunk lines carrying long-distance traffic crisscrossed the area east of the Mississippi. The
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