
© 2014 ITW Renovation & Remodeling, a Division of Illinois Tool Works Inc. 9
Determining Mode Of Operation
The BuildClean HEPA 360° Air Scrubber has been
designed to run in either air recirculation mode or
in negative pressure mode. Before preparing your
unit for operation, rst determine the best mode of
operation for your purposes:
Recirculation Mode: In this mode, the air scrubber
is placed within the room without any ducting. Air is
ltered, cleaned and recirculated within the room.
In most cases, the BuildClean HEPA 360ºAir
Scrubber will be used in the recirculation mode.
Negative Air Pressure Mode: In this mode, the air
scrubber is used to collect dust and to create a slight
vacuum in the area surrounding the machine. To use
the air scrubber in Negative Air Pressure Mode, it is
necessary to use a vent hose (Accessory #512050)
to remove the exhaust air out of the work area. If the
area is sealed and vented correctly, negative pressure
and a slight vacuum is created and air will ow into
the work area minimizing the migration of nuisance
dust outside of the work zone.
Creating a negative pressure environment using
HEPA-Filtered Portable Air Scrubbers
Simplied, to create a negative pressure environment,
more air must leave the space than enters it. To cre-
ate this environment, the project area must be walled
off with permanent or temporary construction barriers.
The air scrubber then must be placed inside the con-
struction area and the air exiting the air scrubber has
to be ducted somewhere outside of the project area,
preferably to the outside of the building. Since the air
is HEPA-ltered, it is not mandatory to exhaust air to
the outdoors.
Air always ows from areas of higher pressure to
areas of lower pressure so air will ow into the work
area from the space under the door and other small
openings. Since dust will not ow against this air
stream the air scrubber is acting as a simple negative
air machine.
Recirculation Mode
Negative Air Pressure Mode
WARNING
DO NOT create an negative pressure environment
around household mechanicals like water heaters
and gas furnaces. Fumes from these items will be
drawn back into the work area and not out the intend-
ed exhaust pipes.