Ariz. Admin. Code § R11-1-1808 - Ventilation, Main Fans - Installation
Main fans shall be:
1. Installed on the surface.
2. Powered electrically from a circuit
independent of the mine power circuit. Internal combustion engines shall be
used only for standby power or where electrical power is not
available.
3. Installed in
fireproof housing provided with fireproof air ducts.
4. Offset not less than 15 feet from the
nearest side of the mine opening and equipped with ample means of pressure
relief unless:
a. The opening is not in direct
line with forces which would come out of the mine should an explosion occur,
and
b. Another opening not less
than 15 feet nor more than 100 feet from the fan opening is equipped with a
weak-wall stopping or explosion doors in direct line with the forces which
would come out of the mine should an explosion occur.
5. Installed to permit prompt reversal of
airflow.
6. Attended constantly, or
provided with automatic devices to give alarm when the fans slow down to stop.
Such devices shall be replaced so that they will be seen or heard by
responsible persons.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.