Orange County NC Website
Browse       Search
<br /> <br /> <br />SPECIFICATIONS FOR DUCT CLEANING <br /> <br />1. Equipment and Workmanship: If the vacuum unit is to be located inside the <br />building the vacuum system shall pull at least 3000 CFM and shall use a filtration <br />system that incorporates HEPA filtration as a final filter. If the vacuum unit is to be <br />located outside the building it shall be a truck mounted unit pulling at least 10,000 CFM. <br />The compartments shall be dust tight. Air compressor must produce a minimum of 175 <br />PSI at 17.5 CFM. All work shall be accomplished by workmen skilled and trained in <br />HVAC system cleaning. <br /> <br />2. Ductwork Cleaning: Ductwork shall be cleaned by inserting a vacuum hose in <br />one end of the duct or trunk line and, with a Reverse Jet Air Nozzle, brush all interior <br />surface areas of the duct system including reheaters, joints, seams, splitters turning <br />vanes, scoops, baffles, cracks, and crevices otherwise inaccessible. As the RJA Nozzle <br />is operating, the residues shall be drawn into the vacuum unit (minimum 3,000 CFM). <br />All foreign materials such as dust, mold, soot, lint, hair, bacteria, and other air <br />movement residues shall be removed from the area. <br /> <br />2.1 Duct Access Openings: Access openings shall be provided at required points <br />of the duct system for physical and mechanical entry. These openings shall be <br />provided as required at points adjacent to turning vanes, dampers, and other <br />obstructions that might tend to trap or entrain dust, dirt, lint, and debris. Duct access <br />openings shall be constructed in accordance with SMACNA HVAC Duct Construction <br />Standards. <br /> <br />3. Grills and Registers: All grills, registers, and diffusers shall be cleaned with a <br />non-toxic, disinfecting solution. Areas around registers shall be lightly cleaned by <br />blowing with air. After cleaning, adjust all registers to insure proper air flow. Leave all <br />areas free of any debris or dust. <br /> <br />4. Coil Cleaning: Coils shall be cleaned using a non-acid coil cleaner sprayed <br />onto the coil and forced into the coil using air pressure, then flushed out using a <br />pressure washer. There shall be no residue of coil cleaner left in the system. <br /> <br />5. Fans: Fan shall be cleaned by using 200 P.S.I. air pressure and an air nozzle <br />designed for that purpose. Each blade of the fan shall be cleaned individually using <br />care not to disturb any balancing weights. <br /> <br />6. Visual Inspection: Upon complete cleaning of each section, notify inspector for <br />visual inspection. Upon acceptance by inspector seal with silicon caulking and neatly <br />patch with galvanized sheet metal the same gauge as the ductwork. <br /> <br />7. Area Clean Up: Every precaution shall be taken to prevent the spread of dust <br />and dirt in occupied areas. All desk, computers and worktable s shall be covered with <br />drop cloths while work is performed in that area. A complete area cleans up after each <br />work cycle shall be performed and no debris left behind. <br /> <br />8. Sealants and Encapsulants: Sealants or encapsulants cannot be substituted <br />for visible contaminant removal. <br /> <br />DocuSign Envelope ID: 01FAC1F3-2604-4A4B-94D5-87B448A45CA5