A room measures 50SolutionRoom has volume 50x30x20 3000 cu

A room measures 50

Solution

Room has volume = 50x30x20 = 3000 cubic feet

Dilution volume flow is 3000 CFM

Concentration at 8.00 a.m. 50 ppm

Dilution in 12 hours = 3000x12x 60 = 2160000 cfm

So contaminant at 8.00 p.m. = 50 ppm -2160000 cft m.

50 -21.60 million

= 28.60 ppm.