What fastener is commonly used with round flexible duct?
A. "S" fasteners (slips) and drive clips.
B. Staples and tape.
C. Self-tapping screws.
D. Tabs and adhesives.
Answer: C
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The elastomer bellows spring has a _____ that fits over the shaft and pushes against the elastomer bellows
a. metal bellows b. special fitted collar c. single-coil spring d. secondary seal face
For each 4 feet of duct, the pressure in the duct drops 0.003 inch of water. What is the pressure drop between the ends of a duct that measures 26 feet?
Fill in the blank(s) with the appropriate word(s).
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A) Cool water B) Superheat steam C) Remove chemicals from a raw material D) All of the above