2.2.8.3.Below-Floor Storage Areas for Liquid Manure (See Note A-2.2.8.3.)

(1) Farm buildings housing livestock with a below-floor storage area for liquid manure shall be provided with a ventilation system conforming to Subsection 2.4.2. (2) Where the ventilation system required by Sentence (1) relies on electrical power for normal operation, it shall be provided with an emergency power supply conforming to Sentence (3). (3) The emergency power supply required by Sentence (2) shall be (a) supplied from a generator, batteries or a combination thereof, (b) equipped with audible and visible trouble indicators, (c) capable of operating the trouble indicators for not less than 24 h, (d) capable of operating the ventilation system under full load for not less than 2 h, and (e) designed so that, in the event of a failure of the normal power source to the farm building, there is an immediate automatic transfer to emergency power. (4) Where a fuel-fired engine or turbine for the emergency power supply required by Sentence (2) is dependent on a fuel supply located outside the farm building, the fuel supply shall be provided with a shut-off valve in conformance with Article 3.2.7.7. (5) Where exhaust piping for the emergency power supply required by Sentence (2) penetrates a required fire separation, the piping shall be enclosed in a service space that is separated from the remainder of the farm building by a fire separation having a fire-resistance rating not less than that of the penetrated fire separation, but not less than 45 min.