Yes, Repair Garages which are enclosed and sealed because comfort cooling is provided still require exhaust at the rate found in Table 403.3.1.1, must be capable of exhausting .75 CFM/Sq ft. and makeup air would also be required per 403.1.
However, 403.2 does allow a registered design professional to design a system where the ventilation system will vary exhaust and supply ventilation to lower CFM's when the concentration of contaminants is at acceptable levels. A design professional can use an NO and CO detector under 403.2 to control ventilation to acceptable levels. This design would save energy, protect the employees, and also meet the intent of C403.2.6.2 of the energy code.
