Per the 2021 International Mechanical Code, metallic HVAC ducts shall be constructed as specified in which standard?
Ducts
Question · Easy
Six feet: a hard-hat anthem
Short
A 12-inch by 12-inch rectangular duct carries air at 800 feet per minute. What is the airflow?
What is the aspect ratio of a 36-inch by 12-inch rectangular duct?
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In the U.S. sheet-steel gauge system used for galvanized duct, what happens as the gauge number increases?
What is the circumference of a 20-inch inside-diameter round duct?
Which SMACNA longitudinal seam is commonly used to close the long side of rectangular galvanized duct?
On a low-pressure rectangular duct joint, which pair of connectors is typically used together as the transverse joint?
Per the 2021 IMC, how shall the male end of a crimped round-metal duct joint be oriented?
Per the 2021 IMC, a round metallic duct joint shall be mechanically fastened with a minimum of how many sheet-metal screws or rivets?
If a designer does not specify a construction pressure class, SMACNA HVAC Duct Construction Standards treat the duct as which default class?
SMACNA Seal Class C requires sealing of which duct features?
SMACNA Seal Class A requires sealing of which duct features?
A 24-inch by 12-inch rectangular duct carries 2,000 cubic feet per minute. What is the average velocity?
Per the 2021 IMC, flexible air ducts and flexible air connectors shall be listed and labeled as which UL 181 classes?
Per the 2021 IMC, what is the maximum length of a flexible air connector?
Per the 2021 IMC, flexible air connectors are prohibited from doing which of the following?
What is the cross-sectional area of a 12-inch by 8-inch rectangular duct, in square feet?
Turning vanes are installed in a square-throat rectangular elbow primarily to:
SMACNA HVAC duct pressure classes are designated at which static-pressure levels, positive or negative?
Question · Medium
Under SMACNA sealing practice, which seal class is assigned to 4-, 6-, and 10-inch water-gauge construction?
In SMACNA HVAC Duct Construction Standards, TDC and TDF formed-flange joints are rated as which joint designations?
SMACNA rectangular-duct gauge and reinforcement tables are based on which sheet material unless the specification says otherwise?
A 20-inch by 10-inch duct is to deliver 1,250 cubic feet per minute. What velocity should you expect?
Using the Huebscher equal-friction formula De = 1.30 × (a × b)^0.625 / (a + b)^0.25, what is the equivalent round diameter of a 12-inch by 12-inch duct?
Per SMACNA flexible-duct installation practice, hangers or supports for flexible duct shall be spaced at intervals not exceeding:
Per SMACNA, the sag of installed flexible duct between supports shall not exceed:
When forming a bend in flexible duct, SMACNA practice requires the centerline bend radius to be not less than:
Per the 2021 IMC, metallic underground ducts that do not have an approved protective coating shall be completely encased in not less than how much concrete?
Per the 2021 IMC, underground ducts shall have a minimum slope of which amount to allow drainage to an accessible point?
Per the 2021 IMC, ducts shall not be installed in or within how many inches of the earth unless they comply with the underground-duct section?
Per the 2021 IMC, duct coverings and linings, including adhesives, shall have a flame-spread index and a smoke-developed index not greater than which pair when tested to ASTM E84 or UL 723?
Per the 2021 IMC, duct lining shall be interrupted at a fire damper and for not less than how many inches upstream and downstream of electric-resistance or fuel-burning duct heaters?
Per the 2021 IMC, a fire damper penetrating an assembly with a fire-resistance rating of less than 3 hours shall have a minimum rating of:
Per the 2021 IMC, fire dampers shall be listed and labeled in accordance with which standard?
Per the 2021 IMC, a smoke damper installed in a duct shall have its smoke detector or sampling tubes located within what distance of the damper?
Per the 2021 IMC, primary heat-responsive devices that actuate fire dampers shall operate at approximately 50°F above normal duct temperature, but not less than:
Per the 2021 IMC, smoke-damper leakage ratings shall be Class I or II, and elevated-temperature ratings shall be not less than:
Per the 2021 IMC, which statement about plenums is correct?
Per the 2021 IMC, stud wall cavities used as air plenums shall comply with which restriction?
Per the 2021 IMC, return air shall not be taken from which of the following locations?
Per the 2021 IMC, a return-air opening shall not be located less than what distance, measured in any direction, from an open combustion chamber or draft hood of another appliance in the same room?
Per the 2021 IMC, tapes and mastics used to seal metallic and flexible air ducts shall comply with UL 181B and shall be marked which of the following?
Per the 2021 IMC, the exception that omits additional closure systems on continuously welded or locking-type joints for ducts under 2 inches water column does NOT apply to which joints located outside conditioned space?
Per the 2021 IMC, ducts connecting to a furnace shall have clearance to combustibles determined by:
Per the 2021 IMC, volume dampers or other means of supply-air adjustment shall be provided where, and what additional requirement applies?
Per the 2021 IMC, floor registers shall resist, without structural failure, which concentrated load?
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