Deck 34: Stretchouts of Square and Rectangular Ducts

Question 1

The dimensions of a rectangular duct with a butt seam are 8 1/2 inches wide by 10 1/4 inches high by 22 3/4 inches long. It has an overlap 1/4 inch. Find the length of the stretchout in inches.

Answer 1

37 1/2 in

Question 2

Usually, the length of the stretchout is the perimeter of the end of the duct minus the allowance for the seam.

Answer 2

False

Question 3

A 3-foot 6 inch long rectangular duct is 8 inches wide and 12 inches high and has a welded seam. What is the stretchout width in inches?

Answer 3

42 in

Question 4

The dimensions of a rectangular duct with a butt seam are 8 1/2 inches wide by 10 1/4 inches high by 22 3/4 inches long. It has an overlap 1/4 inch. Find the width of the stretchout in inches.

Question 5

The dimensions of a rectangular duct with a lap seam are: h = 32 cm; w = 28 cm; l = 85 cm; M = 0.9 cm. What is the width of the stretchout in centimeters?

Question 6

The dimensions of a square duct with a grooved seam are: side = 8 inches; length = 2 1/2 feet; M = 1/8 inch. Find in inches the value of L.S.

Question 7

The dimensions of a rectangular duct with a lap seam are: h = 32 cm; w = 28 cm; l = 85 cm; M = 0.9 cm. What is the length of the stretchout in centimeters?

Question 8

A 3-foot 6 inch long rectangular duct is 8 inches wide and 12 inches high and has a welded seam. What is the stretchout length in inches?

Question 9

The dimensions of a square duct with a grooved seam are: side = 8 inches; length = 2 1/2 feet; M = 1/8 inch. Find in inches the value of W.S.

Question 10

Some ducts will have seam allowances on both ends and some ducts will not have any seam allowances.