Mich. Admin. Code R. 408.30945a - Ventilation; exhaust
Rule 945a. Sections 501.3, 504.4, and 504.9.2, of the code are amended to read as follows:
501.3 Exhaust discharge. The air removed by
every mechanical exhaust system shall be discharged outdoors at a point where
it will not cause a public nuisance and not less than the distances specified
in section 501.3.1 of the code. The air shall be discharged to a location from
which it cannot again be readily drawn in by a ventilating system. Air shall
not be exhausted into an attic or a crawl space, be directed onto walkways, or
terminate within 3 feet of a ventilated section in a soffit.
Exceptions:
1.
Whole-house ventilation-type attic fans shall be permitted to discharge into
the attic space of dwelling units that have private attics.
2. Commercial cooking recirculating
systems.
3. When installed in
accordance with the manufacturer's instructions and when mechanical or natural
ventilation is otherwise provided in accordance with chapter 4 of the code,
listed and labeled domestic ductless range hoods shall not be required to
discharge to the outdoors.
504.4 Exhaust installation. Dryer exhaust
ducts for clothes dryers shall terminate on the outside of the building, shall
not terminate within 3 feet of a ventilated section in a soffit, and shall be
equipped with a back-draft damper. Screens shall not be installed at the duct
termination. Ducts shall not be connected or installed with sheet metal screws
or other fasteners that will obstruct the exhaust flow. Clothes dryer exhaust
ducts shall not be connected to a vent connector, vent, or chimney. Clothes
dryer exhaust ducts shall not extend into or pass through ducts or
plenums.
504.9.2 Duct installation.
Dryer exhaust ducts shall be supported at 4-foot, 1,219 millimeters, intervals
and secured in place. The insert end of the duct shall extend into the
adjoining duct or fitting in the direction of airflow. Ducts shall not be
joined with screws or similar fasteners that protrude into the inside of the
duct.
Notes
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