ASTM F-1120 is often used to specify expansion joints because for many years it was the only ASTM standard addressing metal expansion joints. The specification ASTM F-1120 was developed in the “Ships and Marine Technology” technical committee of ASTM. The intent of this specification is for it to apply to expansion joints that are installed in Naval ships. There are several requirements in F-1120 that are not necessary for a typical HVAC system, such as 100% radiographic inspection and manufactured with an ASME Section VIII stamp. (ASME Section VIII (8) establishes rules of safety governing the design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction). This would be what you would want if you were building an aircraft carrier.

ASTM F-2934 was developed for products intended for HVAC applications.

Metraflex offers expansion joints that meet ASTM F-2934 or ASTM F-1120.