Interpretation #9525
Published May 14, 2026
Original Request
- Code Version
- 2023
- Code
- EXTBLDG
- Code Description
- Chapter
- 7
- Section
- 702.6
- Topic
- Materials and methods
Question
Would this apply to changing an existing building’s total a/c system cooling capacity in total capacity or cooling capacity per a/c system such as rearrangement of capacity per system to total the old tonnage. If the rearrangement were to take an existing building with 3-5 ton units and they want to place 2-6 ton and 1–3-ton units and provide new equipment load calcs?
Answer Published 04/28/2026 at 12:33 PM
To the question, no, 702.6 is for like for like change outs. The work described based on limited information in the inquiry meets the requirements of Level 2 Alterations under Chapter 8.
Commentary
The requirements of the Florida Building Code, Existing Building (FBC, EB), Chapter 8, governing Alterations – Level 2, is the appropriate regulatory path for the scope of work described. This is particularly applicable when the project involves reconfiguring the air‑conditioning system in a manner that affects the delivery of outdoor air to the conditioned spaces.
Under the (FBC, EB), a Level 2 Alteration triggers compliance not only with Chapter 8 but also with the provisions of Alteration Level 1 found in Chapter 7. As a result, projects classified as Level 2 must satisfy both levels of requirements.
In summary, the Existing Building Code directs the design professional to compliance with sections of the FBC Mechanical, FBC Energy Conservation and FBC Building.