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NADCA Approved HVAC Duct Cleaning Procedure

Contamination shall be removed from the air distribution system and all work shall conform to the following specifications:

  • All ducts shall be thoroughly cleaned by power vacuuming and air injections. During the hygienic maintenance program, depending upon area and occupation usage, the supply fans may be left on while the duct cleaning is taking place ensuring conditioned air is supplied to other areas. However, units will be shut down if the project requirements demand and also when they are being worked on.
  • Prior to cleaning each duct system, to ensure no contaminants are emitted into areas that are not being cleaned, temporary filter media is to be fitted to those diffusers, registers or grilles. All openings shall be suitably protected to avoid contamination and debris from entering the conditioned air spaces. Any mechanical defects to be reported to the Construction Supervisor and logged.
  • Power vacuum(s) operating at a minimum of 16,000 C.F. M. at 21” P.S. I., will be connected to the individual duct system or zone at the main air plenum from the remote unit by means of temporary flexible duct of adequate size to accommodate the system being cleaned.
  • Sufficient negative pressure shall be generated within the designated duct runs to ensure all particulate contamination is removed and contained under controlled conditions.
  • Compressed air is then introduced, starting at the remote diffusers, registers or grills and working toward the vacuum system by means of a reverse jet air flow nozzle and 25 C.F.M. air compressor operating 210# P.S.I. Electric power vent cleaner(s) or similar equipment shall be utilized to properly carry out the work until the entire system of ductwork is clean. Suitable protective covering shall be provided by the Contractor in all areas of work operation.
  • By inserting reverse jet air flow nozzles and electric power vent cleaner(s) through the diffusers, registers or grilles, this gently removes all loose contaminants from the interior surfaces of the duct work. Where duct work has internal insulation or other fragile components, take precautions not to disrupt or damage these sensitive areas.
  • Prevent dirt and debris loosened from upstream duct mains and branches during cleaning operations from entering the conditioned spaces by capturing this debris within the filtration at the vacuum device.
  • Duct-mounted volume, fire and zone damper sets are to be marked to their current setting, then inspected and cleaned as necessary. External moving parts are to be treated with an approved dry lubricant material: Aerolex Dry Moly or
  • equal.
  • Sanitizing the air distribution network shall be performed as required. Using a suitable atomizing spray wand inserted through the diffusers, registers, grilles or access panels, coat all interior surfaces of the ductwork with a fine mist of Oxine, or equal. Sanitizing fluid shall be applied to all scope-related surfaces after cleaning.
  • All work is performed in accordance with (NADCA) National Air Duct Cleaners Association Standard 1992-01. Projects are to be supervised by a (NADCA) National Air Duct Cleaners Association Certified Air Cleaning Specialist. Condition report shall be submitted to client with (30) days of completion of project.
  • Caulking or Sealing Compound; 3-M No. 900 duct sealer, Tuff Bond No 29, Peracel No. EZ-4719, Foster 32-14, United Duct Sealer, or equal.
  • All ducts shall be inspected as work proceeds. Any defects in the duct system found during the cleaning process shall be immediately brought to the attention of Construction Supervisor. All repairs such as caulking, sealing and reconnecting shall be performed in additional to contracted scope of work.

Duct Coil Cleaning Process

Duct mounted coils shall be hand washed (air or water) on both coil faces carefully to avoid damage to tubes and fins. Thoroughly clean faces ensuring contaminants are removed. Remove corrosion from around coil frames, hand brush and vacuum clean. Paint all corroded metal frame surfaces. Where necessary, recomb coil fins to restore them to original condition. Before cleaning process begins, on both sides of the coil.

Damper,  Motor and Linkage Cleaning Process

  • Duct-mounted volume, fire and zone dampers shall be inspected, cleaned and repaired as accessible. Mark dampers to their current setting.
  • All related equipment shall be power vacuumed and high pressure washed where required.
  • Areas with rust or scale buildup shall be wired brushed or scraped
  • All damper motors and linkages shall be lubricated as accessible and set into their original position upon completion of work. Lubricant material – Aeolex Dry Moly, or equal.

Variable Air and Mixing Box Cleaning Process ( when accessible )

  • Remove access panel from the base of mixing box taking precautions not to disturb wires, cables or setting of appurtenances of each mixing box or appurtenances adjacent to box.

Equipment Rooms and Air Plenum Cleaning Process

Related air plenums and/or equipment room locations that are within the airstream of this project shall be thoroughly cleaned and sanitized. Such work shall include the following:
  • Remove all water from floor area, note leaks and report on pipe work conditions. Vacuum clean all surfaces including walls, floors and ceiling surfaces. All other debris shall be removed from the area by the Contractor. Plenum areas shall be visually inspected.
  • Remove all corrosion from all metal areas by scraping, sanding or wire brushing
  • Contractor has the responsibility to ensure that all areas are left in a correct operating mode; all switches, lights, doors, hatches and controls are return to their original setting prior to cleaning.
  • Contractor shall, at the end of each shift, remove all waste, dirt and debris resulting from the work performed. Such materials shall be removed from the property in accordance with Section 15050, Article 1.09.

Air Handling Unit Cleaning Process

  • The air handling units shall be cleaned. Prior to work commencement, a pre-arranged schedule shall be established with the Construction Supervisor.  Work on each unit includes the following:
    • Fresh air plenums shall be cleaned thoroughly. Inlet louvers, mixing dampers and turning vanes, if corroded, shall be scraped, primed and top coated as necessary. All debris shall be removed from plenum areas, and concrete floors thoroughly cleaned to remove surface debris.
    • Hand wire brush all areas of side, roof and ceiling panels as necessary.
    • Remove all corrosion from around coil frames and drain pans: hand brush and vacuum clean.
    • Paint affected areas of coil frames using a chromate primer and enamel top coat paint if needed.
    • Heating and Cooling Coils:
  • Cleaning will consist of washing downstream of coil first and then upstream utilizing a high pressure water cleaning system with a suitable biodegradable cleaning agent, thoroughly cleaning coil faces to ensure all contaminants and materials are removed. Take precautions not to damage coil fins. If fins are bent prior to cleaning, straighten (as best as possible) fins utilizing a combing system.
  • High-power wash will be performed with a water spray device that delivers a minimum of 500 P.S.I. Detergent cleaning shall be followed by thorough rinsing with fresh water. Any degreasing of the coils shall be performed before final cleaning to ensure complete removal of any residual build-up
  • Drain pans are to be cleaned and cleared before any pressure washing be performed, thus assuring complete and safe drainage.
  • Vacuum clean and hand wash fin casing and motors so that all grease debris is removed. A degreasing solution shall be used in areas required.
  • Hand scrape fan impellers and remove all loose contaminants from within the fan casing.
NADCA Approved HVAC Duct Cleaning Procedure | Kleen Air | Sacramento, California