Equipment
and Workmanship
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. [return
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Ductwork Cleaning
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. [return
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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. [return to top]
Interior Lining
Special care and attention shall be given to ducts having interior lining
materials and 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. [return to top]
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.
Coil Cleaning
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. [return to top]
Fans
Fan shall be cleaned by using 200 PSI air pressure and an air nozzle
designed for that purpose. Each blade of the fan shall be cleaned individually
using care not to disturb any balancing weights. [return
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Painting
Any areas in the ducts that are found to have visible microbial growth
will be painted using an anti-microbial paint in an area two (2) feet
in either direction of the growth. Paint shall be applied in accordance
with manufacturer's specifications using an airless sprayer or paint
roller, whichever is more practical for the location. No painting will
be done without prior approval of the owner representative. [return
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Visual Inspection
Upon complete inspection of each section, notify inspector for visual
inspection. Upon acceptance by inspector seal with silicon caulking
and neatly patch with galvanized sheet metal the same gauge as the
ductwork. [return to top]
Area Clean Up
Every precaution shall be taken to prevent the spread of dust and dirt
in occupied areas. All desks, computers, and work tables shall be covered
with drop cloths while work is performed in that area. A complete area
clean-up after each work cycle shall be performed and no debris left
behind. [return to top]
Surface Cleaning
After the system has been cleaned and restarted, the entire work area
shall be cleaned of any dust and debris. The ceilings will be lightly
brushed to remove any loose dust, walls will be wiped or brushed, furniture
will be dusted, and carpet and upholstered furniture will be vacuumed
to remove any debris that has been circulated by the HVAC system prior
to cleaning. [return to top]
Sealants
Sealants and encapsulates cannot be substituted for visible contaminant
removal. [return to top] |
