Paragraph 25

In respect of every auxiliary fan at a mine the manager shall fix the minimum quantity of air to be delivered or exhausted per minute at the end of the air duct.

The manager shall make and secure the efficient carrying out of a arrangements whereby at least once in every week a competent person appointed for that purpose by him measures the quantity of air being so delivered or exhausted and determines whether any air is being re-circulated by that fan.

Particulars of the quantity fixed under paragraph (1) and of every measurement and determination made under paragraph (2) shall be recorded forthwith by the manager or the competent person, as the case may be, in a book provided for that purpose by the owner of the mine.