607.5.5.2 Limitations.
MC § 607.5.5.2
Shafts that constitute air ducts or that enclose air ducts used for the movement of environmental air shall not enclose: 1. Exhaust ducts used for the removal of smoke and grease-laden vapors from cooking equipment; 2. Ducts used for removal of flammable vapors; 3. Ducts used for moving, conveying, or transporting stock, vapor or dust; 4. Ducts used for the removal of nonflammable corrosive fumes and vapors; 5. Refuse and linen chutes; or 6. Piping. Exception: Shafts that constitute air ducts or that enclose air ducts used for the movement of environmental air may enclose noncombustible piping conveying water or other nonhazardous or nontoxic materials.
