QUESTION A3 The dimensions of a bag in a filter unit are 8in. in diameter and 15ft. long. Calculate the filtering area of the bag. If the filtering unit consists of 40 such bags and is to treat 480,000ft/h of gaseous waste from an open-hearth furnace, calculate the "effective" filtration velocity in feet per minute. Also calculate the mass of [10] particles collected daily if the inlet loading is 3.1gr/ft3 and the unit operates at 99.99+% collection efficiency. QUESTION A4 A hi-vol clean filter weighs 20.0g. After exposure in the sampler for 24h, the filter (now dirty) weighs 20.3g. The initial and final air flows through the hi-vol sampler were 70 and 50 ft/min, respectively. What was the concentration of particulate matter in the air