16 how do carbon dioxide levels relate to outside air

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16. How do carbon dioxide levels relate to outside air supply requirements?
17. What are the common types of preheaters that are used?
18. What are the three common classifications for commercial air distribution systems?
19. What is the principle of operation for an economizer?
20. How do direct expansion cooling coils differ from indirect expansion coils?
21. How is the total amount of cool air in CFM required for a particular space determined?

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