Equipment and Workmanship
Commercial Duct Cleaning Process – Duct Doctor Raleigh.
If the vacuum unit is to be located inside the building the vacuum system shall pull at least 6000 CFM and shall use a filtration system that incorporates HEPA filtration as a final filter. IF the vacuum unit is to be located outside the building it shall be a truck mounted unit pulling at least 8,000 to 10,000 CFM. The compartments shall be dust tight. Air compressor must produce a minimum of 175 PSI at 17.5 CFM. All work shall be accomplished by workmen trained and skilled in HVAC system cleaning.
Duct Doctor Raleigh – Commercial Ductwork Cleaning Information– Ductwork shall be cleaned by inserting a vacuum hose in one end of the duct or trunk line and, with a Reverse Air Jet Nozzle, brush all interior surface areas of the duct system including reheaters, joints, seams, splitters turning vanes, scoops, baffles, cracks and crevices otherwise inaccessible. As the RJA Nozzle is operating, the residue shall be drawn into the vacuum unit (minimum 6000 CFM). All foreign materials such as dust, mold, soot, lint, hair, bacteria, and other air movement residue shall be removed from the ductwork interior, and will be cleaned to meet NADCA Standard 1992-01.
Duct Access Opening
Access openings shall be provided at required points of the duct system for physical and mechanical entry. These openings shall be provided as required at points adjacent to turning vanes, dampers, and other obstructions that might tend to trap or entrain dust, dirt, lint, and debris. Duct access openings shall be constructed in accordance with SMACNA HVAC Duct Construction Standards.
Duct Doctor Raleigh takes special care with ducts that have interior lining materials. A light vacuum process shall be used to prevent damage to air side surfaces. All loose fibrous materials shall be removed by a combination of controlled forced air and combined vacuum power method.
Grills and Registers
All grills, registers, and diffusers shall be cleaned with a non-toxic, disinfecting solution. Areas around registers shall be lightly cleaned by blowing with air. After cleaning, adjust all registers to insure proper air flow.
Coils shall be cleaned using a non-acid coil cleaner sprayed onto the coil and forced into the coil using air pressure, then flushed out using a pressure washer. There shall be no residue of the coil cleaner left in the system.