A bath fan moves 80 cubic feet per minute. How much air moves in 35 minutes?
Correct Answer
D) 2,800 cubic feet.
At 80 cubic feet per minute for 35 minutes, the fan moves 2,800 cubic feet.
Why This Is the Correct Answer
At 80 cubic feet per minute for 35 minutes, the fan moves 2,800 cubic feet.
Why the Other Options Are Wrong
Option A: 1,800 cubic feet.
1,800 cubic feet. is below the supported result for mechanical airflow calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 2,400 cubic feet.
2,400 cubic feet. is below the supported result for mechanical airflow calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 2,600 cubic feet.
2,600 cubic feet. is below the supported result for mechanical airflow calculation; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Checking Ventilation takeoff: count the condition before counting the package.
Reference Hint
Study anchor (closed-book): memorize Mechanical airflow calculation from California Mechanical Code, California Code of Regulations Title 24. / Title 24 California Mechanical Code exhaust airflow concepts; know the rule or calculation trigger without relying on exam-room lookup.
More Class B Trade Questions
A 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
A 4-inch building drain is laid out with a required 1/8 inch fall per foot. What fall is required across 40 feet?
A rooftop unit schedule shows 3 tons of cooling. Using 12,000 Btu per hour per ton, what cooling capacity is this?
A pump motor is listed as 2 horsepower, and the coordination table asks for watts. Using 746 watts per horsepower, what is the approximate motor power?
A slab is 30 feet long, 18 feet wide, and 4 inches thick. How many cubic yards of concrete are needed before waste?
A footing is 80 feet long, 2 feet wide, and 12 inches deep. How many cubic yards of concrete are required before waste?
A patio subgrade must drain at 2 percent away from the building for 20 feet. What total drop is required?
A building pad needs 150 compacted cubic yards of fill. If the borrow material shrinks 10 percent after compaction, about how many loose cubic yards should be hauled in?
A roofing estimate shows 2,850 square feet of roof area. How many roofing squares is that?
A waterproof deck surface is 14 feet deep and must slope 1/4 inch per foot to the drain. What vertical fall is needed?