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Why is halon no longer manufactured in the United States and hundreds of other countries?

Here is the qs and i will attach file to help you.

1. Why is halon no longer manufactured in the United States and hundreds of other countries? What problem does this pose for owners of halon systems?

2. What are criteria used for classifying an agent as a clean agent? (Hint: Use NFPA 2001)

3. Determine the weight of HFC-227ea required to protect an enclosure 20-ft wide, 40-ft long, and 8-ft high at an ambient temperature of 60 °F and an elevation of 6000 ft, using a 9% design concentration.

4. Determine the volume of IG-541 required to protect an enclosure 12-ft wide, 12-ft long, and 10-ft high, at an ambient temperature of 75 °F and an elevation of – 3000 ft, using 40% design concentration.

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