Blueprint Reading for Sheet Metal Flashcards

What is a 'riser diagram' in an HVAC drawing set?

Answer: A schematic vertical section showing duct runs, sizes, and connections through multiple floors of a building

A riser diagram is a simplified vertical schematic showing how ductwork (or piping) routes through multiple floors. It shows duct sizes, floor penetrations, fire dampers, and equipment connections at each level.

What does 'AS NOTED' or 'A.N.' in a drawing's scale designation mean?

Answer: Different views on the drawing are at different scales, each noted individually

AS NOTED means the drawing contains views at multiple scales. Each view or detail has its own scale noted directly beneath it. The reader must check each view's individual scale notation.

What information does a 'legend' or 'symbol schedule' provide on HVAC drawings?

Answer: A key explaining the meaning of all symbols, abbreviations, line types, and hatching patterns used on the drawings

The legend or symbol schedule is a reference key that explains every symbol, line type, abbreviation, and hatching pattern used on the drawing set. It is essential for correctly interpreting the drawings.

What is the significance of the 'spec section' reference on a drawing note (e.g., 'per Section 233113')?

Answer: It directs the reader to a specific section of the project specification documents that provides detailed requirements

Specification section references (using CSI MasterFormat numbering) direct the reader to detailed written requirements in the project specifications. Section 233113, for example, covers metal ductwork.

What does 'RD' or 'RND' abbreviation on a duct drawing typically indicate?

Answer: Round duct

RD or RND is the abbreviation for round duct on HVAC drawings. It distinguishes round duct sections from rectangular (RECT) duct sections. Round duct dimensions are typically given as diameter.

What is the purpose of a 'submittal' drawing in the sheet metal project process?

Answer: A shop drawing or product data submitted to the engineer/architect for review and approval before fabrication begins

Submittals are shop drawings, product data, and samples submitted to the engineer or architect for review before fabrication. This process verifies that the contractor's proposed methods and materials meet the design intent.