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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> C. Use any cleaning method recommended by NADCA ACR unless otherwise specified; do not use <br /> methods prohibited by NADCA ACR, or that will damage HVAC components or other work, or that <br /> will significantly alter the integrity of the system. It is the contractor's responsibility to select Source <br /> Removal methods that will render the HVAC system Visibly Clean and capable of passing cleaning <br /> verification methods (See applicable NADCA Standards) and other specified tests, in accordance <br /> with all general requirements. No cleaning method, or combination of methods, shall be used <br /> which could potentially damage components of the HVAC system or negatively alter the integrity of <br /> the system <br /> 1. All methods used shall incorporate the use of vacuum collection devices that are operated <br /> continuously during cleaning. A vacuum device shall be connected to the downstream end of <br /> the section being cleaned through a predetermined opening. The vacuum collection device <br /> must be of sufficient power to render all areas being cleaned under negative pressure, such <br /> that containment of debris and the protection of the indoor environment are assured. <br /> 2. All vacuum devices exhausting air inside the building shall be equipped with HEPA filters <br /> (minimum efficiency), including hand-held vacuums and wet-vacuums. <br /> 3. All vacuum devices exhausting air outside the facility shall be equipped with Particulate <br /> Collection including adequate filtration to contain Debris removed from the HVAC system. <br /> Such devices shall exhaust in a manner that will not allow contaminants to re-enter the facility. <br /> Release of debris outdoors must not violate any outdoor environmental standards, codes or <br /> regulations. <br /> 4. All methods require mechanical agitation devices to dislodge debris adhered to interior HVAC <br /> system surfaces, such that debris may be safely conveyed to vacuum collection devices. <br /> Acceptable methods will include those, which will not potentially damage the integrity of the <br /> ductwork, nor damage porous surface materials such as liners inside the ductwork or system <br /> components. <br /> D. Obtain Owner's approval before using wet cleaning methods; ensure that drainage is adequate <br /> before beginning. <br /> E. Ducts: Mechanically clean all portions of ducts. <br /> F. Hoses, Cables, and Extension Rods: Clean using suitable sanitary damp wipes at the time they <br /> are being removed or withdrawn from their normal position. <br /> G. Registers, Diffusers, and Grilles: When removing, take care to prevent containment exposure due <br /> to accumulated debris. <br /> H. Coils: Follow NADCA ACR completely including measuring static pressure drop before and after <br /> cleaning; do not remove refrigeration coils from system to clean; report coils that are permanently <br /> impacted. <br /> I. Air handling units, terminal units (VAV, Dual duct boxes, etc.), blowers and exhaust fans: The <br /> contractor shall insure that supply, return, and exhaust fans and blowers are thoroughly cleaned. <br /> Areas to be cleaned include blowers, fan housings, plenums (except ceiling supply and return <br /> plenums), scrolls, blades, or vanes, shafts, baffles, dampers and drive assemblies. All visible <br /> surface contamination deposits shall be removed in accordance with NADCA Standards. <br /> Contractor shall: <br /> 1. Clean all air handling units (AHU) internal surfaces, components and condensate collectors <br /> and drains. <br /> 2. Assure that a suitable operative drainage system is in place prior to beginning wash down <br /> procedures. <br /> 3. Clean all coils and related components, including evaporator fins. <br /> J. Fibrous Glass Material: Use HEPA vacuuming equipment, under constant negative pressure, do <br /> not permit to get wet, and do not damage surfaces; replace material damaged by cleaning <br /> operations. <br /> K. Existing Damaged Fibrous Glass Material: Report to Architect/Engineer all evidence of damage, <br /> deterioration, delaminating, friable material, mold or fungus growth, or moisture that cannot be <br /> remedied by cleaning or resurfacing with an acceptable insulation repair coating. <br /> 1. Remove unremediable material and clean underlying surfaces. <br /> 2. Replacement of unremediable material is not covered by this specification. <br />