Mechanical coordination best practices
A practical workflow for HVAC coordination during design and construction
The Goal of Mechanical Coordination
Mechanical systems are dimensionally the largest disciplines in a building and have the tightest dependencies on architectural and structural decisions. The goal of mechanical coordination is to ensure the designed system fits, performs, and is maintainable, and to do so before sheet metal and pipe are fabricated, not after.
Coordinate Early With Architecture
- Confirm ceiling height assumptions used for ductwork sizing
- Confirm soffit and bulkhead locations and depths
- Confirm mechanical room sizes vs. equipment with code clearances
- Confirm louver sizes and locations for OA and exhaust
- Confirm equipment screening on the roof or site
- Confirm access panel locations and sizes
- Coordinate AHU and rooftop unit orientations with service access
Coordinate Early With Structure
- Confirm beam depths and locations vs. ductwork routing
- Confirm permissible web openings and locations
- Confirm roof framing sized for equipment loads
- Confirm equipment pad and support requirements
- Confirm penetrations through fire-rated assemblies have detail
- Confirm seismic restraint requirements for equipment and piping
Coordinate With Plumbing and Fire Protection
- Coordinate ductwork vs. sprinkler main routing
- Coordinate diffuser locations vs. sprinkler heads
- Coordinate hydronic piping routes vs. plumbing piping
- Coordinate condensate drain routing to floor drains
- Coordinate gas piping route to mechanical equipment
- Coordinate fire damper locations and access
Coordinate With Electrical and Low Voltage
- Mechanical equipment schedule consistent with electrical equipment schedule
- Disconnect locations within sight of equipment per NEC
- VFD locations coordinated with electrical panel locations
- Control conduit routing
- BAS network and head-end location
- Smoke detector locations for AHU shutdown
BIM Workflow That Works
- Federated model maintained by the architect or BIM manager
- Mechanical model updated at every milestone, not just at CD
- Outside dimensions of ducts and pipes modeled, including insulation
- Equipment modeled with actual manufacturer dimensions for selected models
- Hangers and supports modeled, not just main runs
- Service clearances modeled as space objects
- Clash detection categorized as hard, clearance, or acceptable
Run a coordination-only review of mechanical rooms separately from the rest of the building. The mechanical room is where the most equipment, piping, and clearance requirements converge in the smallest space. Most field RFIs trace back to mechanical room coordination misses.
Common Mechanical Coordination Misses
- VAV box installed where ceiling is fixed and inaccessible
- Fire damper access door not reachable
- Condensate drain with insufficient slope
- Equipment too large to fit through the door to the mechanical room
- Equipment placement blocks code-required service clearance
- OA louver sized for design CFM but blocked by exterior architectural feature
- Exhaust discharge too close to intake or operable window
- Roof equipment without coordinated curbs, supports, or vibration isolation
Pre-Fabrication Coordination
- Issue spool drawings for prefab piping with verified field dimensions
- Trade coordination drawings (sheet metal, piping, sprinkler) signed by all trades
- Equipment dimensions verified against submittal before shipping
- Lay down and rigging plans for large equipment
- Penetration coordination with all impacted trades
Keep exploring
More guides on coordination, MEP review, and field-proof drawing sets.
Service clearances for HVAC equipment and panels.
The most expensive coordination failures and how to prevent them.
Guide to mechanical, electrical, and plumbing plans.
Fire-rated, acoustic, and waterproof penetration requirements.