1) Traces of hydrogen sulfide, methane, carbon dioxide, propane, oxygen gas, and nitrogen gas with 6%, 7%, 8%, 9%, 10%, and 60%, respectively, were found in a waste facility in Payatas. An industrial fan capable of operating under a tenth atm of discharge pressure is to extract the gases of the 30yards by 45 yards by 4meters for about 90seconds. For a square duct with length of 18inches and assuming a fan efficiency of 75% and room temperature of 32C, determine the following: a) the brake power of the fan in hp, b) the static efficiency in %, c) the equivalent height of a triangular duct having the same base as square duct in inches, d) the number of required 10-hp fans.