In mechanical drawings, what does the symbol of a rectangle with an 'X' inside typically represent?
Correct Answer
D) Exhaust fan
A rectangle with an 'X' inside is the standard symbol for an exhaust fan in HVAC drawings. This symbol indicates where air is being removed from a space.
Why This Is the Correct Answer
CORRECT_ANSWER - The rectangle with an 'X' inside is the universally recognized HVAC symbol for an exhaust fan in mechanical drawings. This symbol follows standard drafting conventions where the 'X' represents the fan blades or impeller inside the rectangular housing. The symbol clearly indicates equipment that removes air from a space, distinguishing it from supply or return air components. This standardization ensures consistent interpretation across all mechanical drawings and construction documents.
Why the Other Options Are Wrong
Option A: Fire damper
A return air grille is usually shown as a rectangle with parallel lines or a grid pattern inside, representing the grille slats, rather than an 'X' marking.
Option C: Supply air diffuser
A fire damper is typically represented by a rectangle with 'FD' text inside or specific damper blade symbols, not a simple 'X' marking.
Memory Technique
'X' marks the eXhaust - the X represents fan blades spinning to pull air out of the space
Reference Hint
Florida Building Code - Mechanical, Chapter 5 (Exhaust Systems) and standard HVAC drafting symbol charts in mechanical drawing references
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