Answer the following statement(s) true (T) or false (F)
1. Hydronic heating systems should never use a combination of flexible and rigid piping materials.
2. In the absence of any building or mechanical codes that require otherwise, type M is the standard for copper tubing used in hydronic heating systems.
3. Plumbing codes no longer allow solders containing lead to be used for domestic water service.
4. The molecular structure of nonmetallic tubes such as those made of PEX or rubber compounds is such that oxygen molecules can diffuse through their tube walls and be absorbed by the fluid within.
5. The pressure difference between the inside and outside of the tube has a very strong effect on oxygen diffusion.
1. False
2. True
3. True
4. True
5. False
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Answer the following statement true (T) or false (F)