Do underground parking garages that have exhaust fans require approval?
No. They are exempt from approval requirements. Please refer to Ontario Reg. 505/99, a regulation to amend Ontario Reg. 524/98 made under the Environmental Protection Act. An updated version of Ontario Reg. 524/98 can be obtained from the Ministrys website under the Publication Section/Manuals and Guidance at: http://www.e-laws.gov.on.ca/dblaws/regs/english/980524_e.