HVAC Code Lookup Hub
Use this hub to find **official mechanical, HVAC, ventilation, energy, and air distribution codes** from trusted, authoritative sources. These links take you directly to real code, not summaries.
1. National Mechanical Codes
International Mechanical Code (IMC)
Uniform Mechanical Code (UMC)
NFPA Standards (HVAC-related)
2. Energy & Ventilation Codes
International Energy Conservation Code (IECC)
ASHRAE Standards
3. Ductwork, Sheet Metal & Air Distribution
SMACNA Manuals
4. State Mechanical / HVAC Codes
Each state adopts IMC or UMC with amendments. Below are direct official state code locations: