Article 9D
Secondary heat exchangers
Technical Regulations
Article 9D
Secondary heat exchangers
Chapter: C7.4.1 c
In Simple Terms
Secondary heat exchangers are cooling systems that help manage excess heat in the car. They include the radiator unit itself, any electrical components attached to it, and all the pipes and ducts that deliver cooling air throughout the vehicle.
- Secondary heat exchangers are additional cooling units beyond the main system
- Includes the physical radiator unit, electrical/electronic components, and mounting brackets
- Encompasses all associated cooling infrastructure: ducts, pipes, hoses, and air delivery systems
- These components must comply with specifications defined in Appendix C1
Official FIA Text
Secondary heat exchanger units as defined in Appendix C1. Heat exchanger unit, directly mounted electrical and electronic components. Ducts feeding cooling air, pipes, hoses, AV mounts.
secondary heat exchangercooling systemradiatorthermal managementcooling ducts
2026 Season Regulations