"Does this project require licensed engineer certification?" This is one of the most common questions architects and building owners ask during the early stages of HVAC engineering planning. The answer depends on the building's number of floors, use classification, and project scale. This is the second article in the series, analyzing the scope, content, and practical procedures of HVAC engineer certification from the perspective of legal provisions.

Why Do You Need an HVAC Engineer? Series
  1. HVAC Engineer vs. Technician: The Professional Classification System
  2. Building Code Article 13 and Engineering Certification (This Article)
  3. Central AC System Selection Guide
  4. HVAC Procurement and Government Bidding

1. Provisions of Building Code Article 13

Building Code Article 13 is the legal foundation of the engineer certification system[1]. Its core provision states: the design of buildings must be performed by a licensed practicing architect; however, for the structural, equipment, and other professional engineering portions of buildings with five or more floors or buildings for public use, the responsible architect must assign these to a licensed professional engineer registered in practice.

"Equipment professional engineering" here includes HVAC engineering. In other words, HVAC system design for the following two categories of buildings must legally be certified by a licensed HVAC engineer:

  • Buildings with five or more floors: Regardless of use, any building with five (inclusive) or more floors
  • Buildings for public use: As defined by Building Code Article 5, including hospitals, schools, department stores, hotels, office buildings, apartment complexes, etc.

2. Specific Content of Certification

Engineer certification is not merely stamping drawings. According to the Professional Engineer Certification Rules for Public Works[2], engineer certification includes the following work content:

Design Phase

  • Review and certification of HVAC load calculation reports
  • Confirmation of HVAC system selection reasonableness
  • Verification of equipment specifications and capacity calculations
  • Review of piping system design (ductwork, water piping, refrigerant piping)
  • Review of automatic control system design
  • Confirmation of regulatory compliance (Building Technical Regulations, Energy Management Act, etc.)

Supervision Phase

  • Inspection and confirmation of construction quality
  • Equipment installation compliance checks
  • Witnessing of piping pressure tests and airtightness tests
  • Review of system performance testing (TAB)
  • Review and certification of as-built drawings

3. Additional Requirements for Public Works

For public works undertaken by government agencies, the Government Procurement Act and the Professional Engineer Certification Rules for Public Works impose stricter regulations[3]. Engineers must not only certify design drawings but also perform periodic supervision inspections during construction and issue completion certification reports when the project is finished.

It is worth noting that the engineer's supervision responsibility in public works differs from general on-site supervision. Engineer supervision focuses on "professional judgment of engineering quality" -- confirming that construction results conform to design intent, materials and equipment meet specification requirements, and system performance achieves design standards. It is not daily on-site management work[4].

4. Legal Risks of Non-Compliance with Certification Requirements

Projects that fail to obtain legally required engineer certification face multiple legal risks:

  • Administrative liability: Building permit or occupancy permit applications may be rejected, preventing the project from being legally completed and put into use
  • Civil liability: If damages result from HVAC system design defects, the absence of engineer certification may increase the compensation liability of the owner and contractor
  • Criminal liability: If public safety incidents occur (such as refrigerant leaks, fires, etc.), the absence of design by a qualified engineer becomes an aggravating factor

5. Common Practical Questions

  • Does an HVAC modification during interior renovation require engineer certification? If it does not involve building permit changes and is a small-scale adjustment, certification is generally not required. However, if it involves major equipment replacement or system architecture changes, consulting an engineer is recommended
  • Does a factory's HVAC system require engineer certification? If the factory qualifies as a public-use building or has five or more floors, certification is legally required. Even outside the legally mandated scope, engineer certification has substantial value for industrial safety considerations
  • How are engineer certification fees calculated? They depend on project scale, complexity, and scope of services, typically calculated as a percentage of total project cost, referencing the recommended fee schedule published by the engineer association

Conclusion

The essence of the engineer certification system is an institutional design that ensures engineering quality through professional responsibility. It guarantees that HVAC system designs are reviewed by professional engineers who have passed national examinations and are professionally supervised during construction. For building owners, engineer certification is not just a regulatory requirement but an insurance policy for engineering quality. In the next article, we will explore the technical aspects of central AC system selection -- an engineering comparison of VRF, chiller, and split systems.