Describe how rectangular sheet metal ducts are joined
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Rectangular ducts are joined by S-locks and drives cleats. S locks are used on the larger duct dimension, usually the top and bottom. The shorter dimensions are joined by drive cleats. The duct edges are turned back, the drive cleat slips over the edges and pulls the duct together. These are driven down with a mallet; thus the name, drive cleat. These joints sealed with UL 181-A mastic or UL 181-A tape and mastic.
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A) Should buy more environmental quality. B) Is in equilibrium. C) Should buy more cheap food. D) Can't tell; insufficient information given to answer this question.
What does the top chord and bottom chord of a K-series joist consist of?
What will be an ideal response?
Using commercially prepared guide specifications is a move in the direction of standardization in writing specifications
Indicate whether the statement is true or false
? Identify and state the historical significance of William Randolph Hearst.
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