Read section 403.3.1.1 then go to Table 403.3.1.1. The Table says there will be 5 occupants per 1000 sq. ft. 1700 divided by 1000 = 17 . 5 x 17 = 85 occupants.  Furthermore, the Table says we need 5 cfm outdoor air per occupant, thus 85 occupants x 5 cfm = 425 total cfm must be introduced into the office.

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