Specifications include, but are not limited to: A. General: Provide factory-fabricated air handling units with capacity as indicated on the schedule. Units shall have overall dimensions as indicated and fit into the space available with adequate clearance for service as determined by the Engineer. Units shall be completely assembled or multiple sectioned, shall be shipped as a single package (except where shipping limitations prevent) de-mounted into modular sections in the field by the contractor. Units shall be furnished with sufficient gasket and bolts for reassembly in the field by the contractor. Unit manufacturer shall provide certified ratings conforming to the latest edition of AMCA 210, 310, 500 and AHRI 410. All electrical components and assemblies shall comply with NEMA standards. Unit internal insulation must have a flame spread rating not over 25 and smoke developed rating no higher than 50 complying with NFPA 90A, “Standard for the Installation of Air Conditioning and Ventilating Systems.” Units shall comply with NFPA 70, “National Electrical Code,” as applicable for installation and electrical connections of ancillary electrical components of air handling units. Tags and decals to aid in service or indicate caution areas shall be provided. B. Rigging Provision – Multiple Piece Units: Units shipped in multiple sections shall be engineered for field assembly. All gasket and necessary assembly hardware shall ship loose with unit. Junction boxes with a factory supplied numbered terminal strip shall be supplied at each shipping split for reconnection of control wiring. C. Unit Casing – The construction of the air handling unit shall consist of a non-skeleton structure made by a “C” or “L” sandwich 2.0 inch thick polyurethane foam with an external side 22 gauge coated steel and 25 gauge galvanized steel on the inside, making it a double wall construction. All the elements are connected with sealed joints. D. Cabinet air leakage shall not exceed 1% of CFM, at +/- 8 in wg.
