Discuss some of the major problems that cause leaky duct systems in older homes
What will be an ideal response?
Using walls, floor joists and ceiling joists for ductwork. Takeoffs on supply and return plenums.
Using non-UL approved duct tape and no mastic for sealing.
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____ refers to the process of verifying the correctness of reassembly.
a. Field testing b. Bench testing c. Dry testing d. Wet testing
What is the MMC of a hole with the dimension Ø.745/.755?
a. .745 b. .755 c. .750 d. none of the above
A suspension mount bolt hole has become enlarged in a frame due to shear forces. What should be done?
A. replace the frame B. drill oversize to the next bolt size up C. ream oversize to the next bolt size up D. grind a taper on the bolt and drive in
What air property is measured in grains?
A) Relative humidity B) Wet bulb temperatures C) The weight of air D) Grains are used to measure the amount of water in the air