Question 28 - A valuable painting is in a display case 10 ft. wide, 12 ft. long, and 10 ft. tall, elevated 2 ft. above a solid oor. The case is centered in a 20 ft. long by 20 ft. wide enclosure with 14 ft. high walls on all sides. Use the rate-by-volume method of local application to calculate ow rate and the total amount of carbon dioxide required, assuming a discharge time of 30 seconds