SMACNA HVAC Duct Constructions Standards Questions & Answers PDF

SMACNA HVAC Duct Constructions Standards Metal & Flexible, 4th Edition Questions and Answers 1. SMACNA suggests a 36" duct be supported by vertical supports fabricated with 1"x1"x1/8" angle at ______ foot intervals maximum. A. 6 B....

SMACNA HVAC Duct Constructions Standards Metal & Flexible, 4th Edition Questions and Answers 1. SMACNA suggests a 36" duct be supported by vertical supports fabricated with 1"x1"x1/8" angle at ______ foot intervals maximum. A. 6 B. 10 C. 12 D. 15 2. A 24 inch by 16-inch rectangular duct with a 1 ½-inch flexible liner will have exterior dimensions of __________. A. 24.5 inches by 16.5 inches B. 25.5 inches by 17.5 inches C. 26.5 inches by 18.5 inches D. 27 inches by 19 inches 3. The minimum aluminum equivalent required to replace 22-gauge galvanized steel is __________. A..027 B..034 C..043 D..052 4. Metal nosing shall be used on upstream edges of liners at every transverse joint when velocities exceed __________ fpm. A. 1,400 B. 2,400 C. 4,000 D. 5,000 5. Collars to which flexible duct is attached shall be a minimum of __________ inches in length. A. 2 B. 3 C. 4 D. 8 6. Sleeves used for joining two sections of flexible duct shall be a minimum of __________ inches in length. A. 2 B. 4 C. 5 D. 3 7. Metallic flexible duct shall be attached with __________. A. Less than three #8 sheet metal screws B. Less than four # 8 sheet metal screws C. At least five #8 sheet metal screws D. At least three #8 sheet metal screws 8. Flat oval duct construction shall be capable of with standing a pressure __________ percent greater than that of the assigned pressure class without structural failure or permanent deformation. A. 50 B. 45 C. 40 D. 60 9. Duct joints are normally strong enough to permit maximum hanger spacing at __________ foot intervals. A. 6 to 8 B. 8 to 12 C. 8 to 10 D. 6 to 10 10. Each layer of rectangular duct using flexible liner shall be attached with __________ coverage of adhesive at the liner contact surface area. A. 70% B. 75% C. 80% D. Adequate 11. A joint running 90 degrees parallel or perpendicular to the airflow is a __________ joint. A. Transverse B. Longitudinal C. Vertical D. Horizontal 12. Air duct designed for a duct pressure class of ½-inch (w.g.) has an operating pressure up to __________ inch (w.g.). A. Up to ½ B. ½ up to 1 C. 1 up to 2 D. 2 up to 3 13. For a Type L-1, metal duct __________ seam, the pocket depth varies from 1/4 inch to 5/8 inch, depending on the gauge of metal and the roll form equipment. A. Grooved B. Pittsburgh lock C. Standing D. Slide lock 14. The rectangular elbow is 40 inches. The radius centerline is __________ inch(es). A. 40 B. 54 C. 60 D. 72 15. When using a button punch snap lock for metal duct work, the seam may be used for __________ inch w.g. static or less. A. 2 B. 3 C. 4 D. 6 16. The T-1 flat drive is not suitable for use as reinforcement for 26 gage metal when the duct wall static pressure is __________ inch water gage. A. 1 B. 2 C. 3 D. 4 17. Flexible liners for rectangular ducts must be installed with mechanical fastening devices that are as corrosion resistant as __________. A. Possible, without being cost prohibitive B. Galvanized metal C. G60 coated galvanized steel D. Stainless steel 18. The rectangular elbow is 54 inches. The centerline radius is __________ inches. A. 40 B. 54 C. 60 D. 81 19. For a metal duct Joint T-1, drive slip, use gauge not less than two gauges less than duct gauge, with __________ gauge minimum. A. 16 B. 20 C. 22 D. 24 20. For a Type L-1, metal duct Pittsburgh lock seam, the most common pocket sizes are __________. A. ¼ inch to 5/8 inch B. ¼ inch to 3/8 inch C. 5/16 inch to 5/8 inch D. 5/16 inch to 3/8 inch 21. Type L-4 metal duct standing seams used on duct-interiors should be fastened together at the ends and at __________ inch intervals. A. 5 B. 6 C. 7 D. 8 22. When installing rectangular ducts using flexible liner, ducts with interior widths of __________ require mechanical fasteners in addition to adhesive. A. 8 inches or more B. 8 inches or less C. More than 8 inches D. At least 8 inches 23. The 4 x 8 sheets cost $6.50 per square foot to install. The material cost $3.00 per square foot. There are 8 sheets of 26 gage black iron to fabricate. The material cost is __________. A. Less than $700 B. Between $700 and $1,000 C. Between $1,000 and $1,300 D. More than $1,300 24. Zinc coated steel costs $58 per 4 x 8 sheet. There are 14 sheets of 22 gage zinc coated steel to fabricate. The total weight of the coated steel is __________. A. Less than 700 pounds B. Between 700 and 800 pounds C. Between 800 and 900 pounds D. More than 900 pounds 25. The pounds of steel required to construct the piping from elevation 24.2 to elevation 51.2 is __________. A. Less than 1,000 B. Between 1,000 and 1,200 C. Between 1,200 and 1,400 D. More than 1,400 26. The equivalent aluminum to match galvanized steel 24 gage is __________. A..028 B..034 C..032 D..023 27. The maximum duct width for a T-1 flat drive 24 gage reinforcement with ½-inch water gage is __________ inches. A. 10 B. 18 C. 20 D. 14 28. The discharge position is identified by all except __________. A. CCWUBD B. CCWTHD C. CCWBGD D. CCWBADD 29. Slips and drives must not be less than __________ gage(s) lighter than the duct wall. A. 1 B. 2 C. 3 D. 4 30. The minimum gage for slips and drives is __________. A. 20 B. 22 C. 24 D. 26 31. When installing rectangular ducts using flexible lining, which is not correct? A. The liner surface designated to be exposed shall face the air stream B. The duct dimensions shall be decreased as necessary to compensate for liner thickness C. Each layer of duct shall be attached with adequate coverage of adhesive at the liner contact surface area D. Longitudinal joints in liners shall be coated with adhesive when velocities over 2,500 fpm are anticipated 32. The minimum thickness of a 72” access door is _______ gage. A. 16 B. 20 C. 22 D. 24 33. The duct is 32 inches. Using a Double "S" slip joint, the minimum gage allowed is __________. A. 24 B. 22 C. 20 D. 18 34. Tom is installing negative 10-inch water gage round duct. The longitudinal seam duct is 34 inches in diameter. The smallest angle he can use is __________. A. 1" x 1"x 1/8" B. 1 ¼” x 1 ¼" x 3/16" C. 1 ½" x 1 ½" x 3/16" D. 2" x 2" x 3/16" 35. Given an operating pressure over one-half inch up to one-inch water gage, the duct pressure class is __________ inch water gage. A. 1 B. 2 C. 3 D. 4 36. The Pittsburgh seam is a Type L- __________ longitudinal seam used on rectangular ductwork. A. 1 B. 2 C. 3 D. 4 37. The Type L-3 longitudinal duct seam refers to all of the following except __________. A. Pipe lock B. Snap lock C. Flat lock D. Grooved seam 38. The flat drive slip T-1 is suitable for use as reinforcement for a __________. A. 26 gage duct wall 20 inches wide, with a maximum reinforcement spacing of 12 feet and a 1- inch water gage static B. 26 gage duct wall 22 inches wide, with a maximum reinforcement spacing of 10 feet and a ½- inch water gage static C. 24 gage duct wall 22 inches wide with a 1-inch water gage static pressure D. 24 gage duct wall 20 inches wide with a ½-inch water gage static pressure 39. Screws can be spaced no more than __________ inches apart on duct access panels. A. 12 B. 10 C. 8 D. 6 40. The installation of dampers, turning vane assemblies or other devices placed inside lined ducts or fittings __________. A. Must not damage the liner or cause erosion of the liner B. Must be accompanied by appropriate buildouts C. Is strongly discouraged D. Is prohibited as of January 1, 2006 41. Unless otherwise specified, steel sheet and strip used for duct and connectors must be __________ coated galvanized steel of lock-forming grade conforming to ASTM A653 and A924 standards. A. G-22 B. G-24 C. G-55 D. G-60 42. The Type L-2 longitudinal duct seam may be used for __________ inch water gage static or less. A. 6 B. 5 C. 4 D. 3 43. Fasten longitudinal standing seams on ducts at the ends and at __________ inch intervals. A. 10 B. 8 C. 6 D. 4 44. Duct access panels must be __________. A. At least equal to the duct gage B. 26 gage C. 24 gage D. 22 gage 45. Ducts with interior widths of __________ inches or less do not require mechanical fasteners in addition to adhesive. A. 6 B. 8 C. 10 D. 12 46. A 48-inch width coil or sheet stock of manufacturers standard 10 gage uncoated steel weighs __________ pounds per square foot. A. 2.500 B. 3.125 C. 4.375 D. 5.625 47. Four sheets of 36 inch by 120-inch 28 gage galvanized sheet metal weighs __________ pounds. A. 93.72 B. 76.4 C. 105.7 D. 1.884 48. The 60 x 18-inch rectangular duct is paired at 5-foot spacing. The minimum size of the strap hangers is 1 inch by __________ gage. A. 22 B. 20 C. 18 D. 16 49. The 12-inch round duct requires a __________-inch rod. A. ¼ B. 3/8 C. ½ D. 5/8 50. The type lock used for straight duct and fittings is the __________. A. Pittsburgh lock B. Button punch snap lock C. L-4 Standing seam D. Flat lock 51. Rectangular ducts with flexible liners with an interior width of 6 inches __________. A. Require mechanical fasteners in addition to adhesive B. Do not Require mechanical fasteners in addition to adhesive C. Shall be coated with adhesive when velocities are over 2,000 FPM D. Shall have metal nosings used on the downstream edges of the liner 52. Belt guards shall conform to the regulations of __________. A. The building official B. DBPR C. SMACNA D. OSHA 53. The drawing below is representative of a/an __________. A. Volume damper B. Wye junction C. Smoke damper D. Standard junction 54. The operating pressure required for one-inch wg. is __________. A. Up to ½-inch wg. B. Over ½-inch up to 1-inch wg. C. Over 1-inch up to 2-inch wg. D. Over 1-inch wg. 55. Reinforcement for flat sides of oval duct shall be __________. A. Aluminum.043 or greater B. Galvanized 24 gage or better C. Of a size equal to or greater and spaced at intervals specified for flat oval duct D. Of the same size and spacing interval as specified for rectangular duct 56. The maximum sag between flexible duct supports is __________ inch(es) A. ½ B. 1 C. 2 D. 2½ 57. Class C used for transverse joints only is applicable for static pressure construction class up to __________ wg. A. 1 B. 2 C. 3 D. 4 58. The centerline radius for the centerline radius drawing above is __________ inches. A. 24 B. 36 C. 48 D. 60 59. The Pittsburgh lock is good to __________ water gage. A. Plus 10 B. Minus 10 C. Plus or minus 8 D. Plus or minus 10 60. A 28-inch 20 gage round spiral seam duct 100 feet long weighs __________ pounds. A. 12.9 B. 129 C. 1,290 D. 680 61. A ¼-inch single hanger rod for rectangular duct should have a maximum allowable load of __________ pounds. A. 80 B. 120 C. 160 D. 270 62. The number of mitered pieces required for a mitered elbow ay 90 degrees when the velocity is less than 1,000 feet per minute is __________. A. 1 B. 2 C. 3 D. 4 63. Discharge fan Number 2 is a/an __________. A. CWUBD B. CCWDBD C. CCWTADD D. CCWUBD ****Please see Answer Key on the following page**** 1/7/22  SMACNA HVAC Duct Constructions Standards Metal & Flexible, 4th Edition Questions and Answers Answer Key Answer Page # 1. C 5.18, Figure 5-9 Supports From Wall (Note #1) 2. D 7.14 24 + 1.5 + 1.5 = 27 16 + 1.5 + 1.5 = 19 3. C 2.124, Table 2-50 Thickness Adjustments 4. C 7.14 5. A 3.48 6. B 3.48 7. D 3.48 8. A 3.27 9. C 5.2 10. D 7.14 11. A 2.112, Figure 2-9 Unreinforced Duct 12. A 1.18, Table 1-3 Static Pressure 13. B 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 14. C 4.3, Figure 4-2 Rectangular Elbows 3 x 40 ÷ 2 = 60 15. C 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 16. D 2.110, Table 2-48 T-1 Flat Drive Accepted as Reinforcement 17. C 7.14 18. D 2.3 3 x 54 ÷ 2 = 81 TRY 54 + 50% Yields 81 19. D 2.6, Figure 2-1 Rectangular Duct/Transverse Joints 20. A 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 21. D 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 22. C 7.14 23. B A.2 8 x 32 x 3.00 = $768  Answer Page # 24. A A.l 14 x 32 x 1.406 = 629.8 25. B A.2, A.10 30 ÷ 12 = 2.5 feet 3.14 x D x L x WPF = Pounds 3.14 x 2.5 x (51.2 - 24.2) x 5.625 = 1,192.2 26. B 2.124, Table 2-50 Thickness Adjustments 27. C 2.110, Table 2-48 T-1 Flat Drive Accepted as Reinforcement 28. C A.18 29. B 2.108 30. C 2.108 31. B 7.14 32. B 9.22, Table 9-2 Plenum and Casing Access Doors – 2 in. wg 33. B 2.7, Figure 2-1 Rectangular Duct/Transverse Joints 34. D 3.6, Table 3-4 Companion Flange Joints Used as Reinforcement 35. A 1.18, Table 1-3 Static Pressure 36. A 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 37. B 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 38. D 2.110, Table 2-48 T-1 Flat Drive Accepted as Reinforcement 39. C 7.2, Figure 7-2 Duct Access Doors and Panels 40. A 7.14 41. D 1.2 42. C 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 43. B 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 44. A 7.2, Figure 7-2 Duct Access Doors and Panels 45. B 7.14 46. D A.2 47. A A.1 36 ÷ 12 = 3 and 120 ÷ 12 = 10 # Sheets x L x W x WPF = Pounds 4 x 10 x 3 x.781 = 93.72 48. B 5.7, Table 5-1 Rectangular Duct Hangers Minimum Size 49. A 5.9, Table 5-2 Minimum Hanger Sizes for Round Duct  Answer Page # 50. A 2.10, Figure 2-2 Rectangular Duct/Longitudinal Seams 51. B 7.14 52. D A.19 53. B 1.21, Figure 1-3M Symbols for HVAC Systems (SI) 54. B 1.18, Table 1-3 Static Pressure 55. D 3.27 56. D 3.52, Figure 3-10 Flexible Duct Supports 57. B 1.11, Table 1-1 Standard Duct Sealing Requirements 58. B 4.3 59. D 2.10 60. C A.9 61. D 5.7, Table 5-1 Rectangular Duct Hangers Minimum Size 62. C 3.1, Table 3-1 Mitered Elbows 63. D A.18