| Capital Projects Home Page |
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| Division 15 Mechanical |
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| 15-11 | Heating And Ventilating Duct System Cleaning |
| A. | Coordination |
| 1. | Coordinate schedule and requirements with Capital Projects (CP). |
| 2. | Capital Projects (CP) will notify the building occupants of the work to be done, the schedule, the contact person in case of complaints, and the availability of protection covers (to be provided by the contractor) for those who want them. Work should be scheduled when the areas are unoccupied, where possible. |
| B. | Drawings |
| 1. | Provide a current heating and ventilating plan showing all existing systems. |
| 2. | Show the fans, coils, ducts and outlets to be cleaned. |
| 3. | Access must be provided to all duct interiors, coils, fans and dampers. Where new access doors are required, show the locations. Where ceiling access doors will be required, coordinate finishes and products for existing construction. |
| 4. | Coordinate with Capital Projects (CP) for areas that require special protection and indicate these on the drawings. |
| 5. | If more than one supply fan is involved, define the areas served by each fan. |
| C. | Specifications |
| 1. | Determine and indicate the hours when the work can be performed, when the fans will be turned on and off, and who is responsible. Specify when the supply fan will be run in order to observe if any visible dirt is deposited in the areas served. |
| 2. | Access Doors |
| a. | Duct: Door may be 20-gauge galvanized steel slide-gate type secured with parker screws and 1/2" flange to serve as handle and stop, or round galvanized steel spun into a round opening. Size as required by duct size. |
| b. | Ceiling: Select product suitable for existing finishes and fire ratings. |
| 3. | The contractor shall conspicuously mark the initial setting of any air control devices that must be moved to properly clean the duct system. After cleaning, return each device to its original marked position and secure in place. |
| 4. | Clean all ducts using an industrial-type vacuum cleaner. Inspect cleaning work in all portions of ducts. Remove, brush and vacuum supply diffusers or grilles, including damper or volume control, at completion of duct cleaning. |
| 5. | Clean all coils using an industrial-type vacuum cleaner on the entering air side of the coil and a high pressure air jet (50 pounds per square inch minimum) blowing back from the leaving air sides. Continue until all passages are clear. |
| 6. | Before each section of duct, coils, fan and outlets is cleaned and before the system fan is turned on, cover each outlet with a filter. Filters shall be a minimum of 1/2" thick fiberglass filter mat covered and held in place with cheese cloth and duct tape or other appropriate method. The filters shall remain in place until the cleaning is completed and accepted. |
| 7. | After all outlet filters are in place and before leaving the building, turn on supply fan serving the area for one hour maximum. The contractor shall check all areas served by this fan for any visible dirt entering through loose or improperly installed outlet filters. |
| 8. | While fan is operating, the contractor shall clean furniture, floors, and other surfaces showing visible dirt that has been discharged through loose or faulty outlet filters. |
| 9. | Carefully place all removed dust and dirt in plastic trash bags, close and securely tie. Specify storage location and responsibility for disposal. |
| 10. | The contractor shall provide the University with protection sheets to be distributed by the University to the building occupants. Coordinate with Capital Projects (CP) and specify the size and number to be provided. |
| 11. | Bidding shall include a per-hour unit price for room cleaning exceeding contract requirements. |
| 12. | The contractor shall prepare a checklist of all rooms and areas affected by the project. The checklist shall be used to check room cleanup, furniture in original position, and outlet filters in place. The checklist shall be maintained by the contractor's superintendent, for each work period. |
| 13. | Submittals shall include: |
| a. | Ceiling and duct access doors. |
| b. | Outlet filters |
| c. | Filter fastening method. |
| d. | Protection sheets for furnishings. |
| e. | Fan system filters. |
| f. | Work schedule and number of workmen. |
| 14. | The contractor shall furnish his personnel with legible identification badges bearing the worker's name and the name of the company. The badges shall be worn at all times while on the job site. |
| D. | Filters |
| 1. | Replace all fan system filters. Clean supply and intake plenums, louvers, bird screens, and filter banks. |
| 2. | Replace worn, missing, or damaged filter frame gaskets. |
| 3. | Replace broken filter clips and change or adjust filter clips to fit the University's standard filters. Filter clips shall have wire loop end for securing filter frame. |
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