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14 U 96Q 3. 2. Mechanical and Utility Equipment. You must have a provision in your ordinance that specifically requir+ss mechanical and utility equipment to be elevated above the base flood elevation or designed so as to prevent water from ent-er .ng or accumulat- ing within the equipment components . [see -It 6.1.3(a) (iv)I - You may meet this requirement by demonstrating that your current ordinance already contains such a provision or by incorporating the following or its equivalent into your ordinance_ Electrical, heating, 'ventilation, plumbing, and air-conditioning equipment and other service facilities shall be desi rued -and/or located so as to prevent water_ fr-o:n entering or accumulating within the er-gupornents during - conditions of flooding. 3 . Definition of Start of Construction. The final rule modifies the definition of "start of construction" to eliminate incon- sistencies in treatment between pile and- calumn structures and other types of foundations and to incorporate the 'manufactured home" revisions . You must replace your definition, 'start of construction," with the definition in the. final rule. 4 . Use of 0 enin s in Enclosures Below a Structure' s Lowest Floor. The final rule adds a provision which requires that fully enclosed 'areas below the base flood elevation be designed to allow for the automatic entry and exit of. floodwaters to equalize hydrostatic flood forces [see ftEO-3(c) (5)1 • You can comply with this requirement by prohibiting the enclosure Of areas below the base flood elevation or by incorporating the following provision or its equivalent i.nt<> your ordinance: For all new construction and sub!Htantial improve- ments, fully enclosed areas below the 7.owest floor that are subject to flooding shall be design:ed to automatically equalize hydrostatic flood forces on exterior walls by allowirsg fc4r the entry and exit of floodwaters. Designs for- meeting this requirement must either be certified by a registered professional engineer. or architect or must meet or exceed the followirsg minimum crit.er=a: A minimum of two openings having a total net area of not less than one square inch fcxr every square foot of enclosed area subject do flooding shall be pro- vided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters .