Mechanical drawings show a building’s HVAC system design, including ductwork routing, equipment placement, and vent locations.
HVAC contractors size and install equipment based on these drawings.
What Does a Mechanical Drawing Show?
- Ductwork routing and sizing
- Equipment placement, like furnaces and air handlers
- Supply and return vent locations
- Coordination points with framing and other trades
Why Are Mechanical Drawings Important?
A mechanical drawing for a two-story addition would show how supply ducts route from a rooftop unit down through a chase to reach rooms below. Poor coordination between mechanical and structural drawings is a common cause of ducts needing rerouting mid-construction, which adds cost and delay.
Mechanical Drawing vs. Electrical Drawing
Mechanical drawings cover heating, cooling, and ventilation systems, while electrical drawings cover wiring, outlets, and panels. Both are separate trade-specific drawing sets that need to be coordinated with each other and with the structural framing to avoid conflicts.