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"903.3.1.4 Freeze protection. Freeze protection systems for <br />automatic fire sprinkler systems shall be in accordance with the requirements <br />of the applicable referenced NFPA standard and this section. <br />"903.3.1.4.1 Attics. Only dry -pipe, preaction, or listed <br />antifreeze automatic fire sprinkler systems shall be allowed to protect <br />attic spaces. <br />'Exception: Wet -pipe fire sprinkler systems shall be allowed to <br />protect non -ventilated attic spaces where: <br />"1. The attic sprinklers are supplied by a separate floor control <br />valve assembly to allow ease of draining the attic system <br />without impairing sprinklers throughout the rest of the <br />building, and <br />"2. Adequate heat shall be provided for freeze protection as per the <br />applicable referenced NFPA standard, and <br />"3. The attic space is a part of the building's thermal, or heat, <br />envelope, such that insulation is provided at the roof deck, <br />rather than at the ceiling level. <br />"903.3.1.4.2 Heat trace/insulation. Heat trace/insulation <br />shall only be allowed where approved by the fire code official for small <br />sections of large diameter water -filled pipe." <br />Section 903.3.5, Water supplies, shall be amended to read as follows: <br />"903.3.5, Water supplies. Water supplies for automatic sprinkler <br />systems shall comply with this section and the standards referenced in Section <br />903.3.1. The potable water supply shall be protected against backflow in <br />accordance with the requirements of this section and the International <br />Plumbing Code. For connections to public waterworks systems, the water <br />supply test used for design of fire protection systems shall be adjusted to <br />account for seasonal and daily pressure fluctuations based on information <br />from the water supply authority and as approved by the fire code official. <br />"Water supply as required for such systems shall be provided in <br />conformance with the supply requirements of the respective standards; <br />however, every water-based fire protection system shall be designed with a <br />10 psi safety factor. Reference Section 507.4 for additional design <br />requirements." <br />Section 903.3, Installation requirements, shall be amended by adding Section <br />26 <br />