Codes, Standards, and Professional Practice
Codes, Standards, and Professional Practice
This domain tests the documents and standards that govern the work, plus jobsite professionalism. You must know when to ask, document, and inspect.
Core rules
- Codes: the International Mechanical Code (IMC) and International Residential Code (IRC) govern duct installation; NFPA 90A governs air-handling systems; ASHRAE 62.1 addresses ventilation; SMACNA provides duct construction and seismic standards; UL 181 covers duct materials and connectors.
- Submittals and RFIs: submit product data and shop drawings for approval. If field conditions conflict with drawings, issue a request for information before proceeding.
- Change orders: get written authorization before doing extra work.
- Inspections: fire damper, duct leakage, and final inspections must be documented.
- Ethics: report unsafe work, do not conceal defects, and keep accurate records.
Worked example
A field duct route conflicts with a structural beam. The crew should not cut the beam or reroute without approval. They issue an RFI with photos and dimensions; the designer responds; if the fix adds cost or time, a change order is issued before installation. The reasoning: the contract documents define scope, and undocumented field changes shift risk and can violate code.
Traps
Installing before submittal approval; treating a verbal go-ahead as a change order; ignoring firestopping; and assuming the latest drawing supersedes an approved submittal without confirmation.