Speed Control
The air flow can be regulated from 300 to 1900 cfm by using the HIGH/VARIABLE speed selector switch and the SPEED
CONTROL knob.
Start the Machine
To start the machine in high speed, set the rocker switch HIGH/VARIABLE speed to the HIGH position. In this position
the SPEED CONTROL is disabled.
To start the machine in VARIABLE SPEED, set the rocker switch to the VARIABLE SPEED position and rotate the SPEED
CONTROL knob clockwise to obtain the desired airflow. When the filters are clean, the pressure gage will indicate
about 2.1” WC of vacuum at high speed. As the filters fill with dust, the efficiency of the filters are maintained, but the
airflow will decrease and the vacuum reading will increase. Change the primary/secondary filter frequently to protect
the HEPA and to get more air flow. When the vacuum gage reaches about 3.0” WC, with a clean pre-filter, the HEPA
filter will have to be replaced to restore the air flow. Accessories such as an optional intake manifold can be used on
the suction side of the unit providing 12” connection for the flex duct. The discharge side of the unit has a 12” diameter
ring for a flex duct.
Maintenance
The blower and motor do not require any maintenance when the machine is operated with the HEPA filter in place.
Pre-Filter Replacement
The primary/secondary filter should be changed when the orange side shows it is loaded with dust. Changing the
filter can be done while the machine is running. Ensure that the orange side of the prefilter is facing the HEPA filter.
HEPA Filter Replacement
During your projects, your HEPA filter purifies the air and gradually becomes loaded
with sub-micron particulates. Even when the HEPA filter is fully loaded, the filter is still
removing particulates from the air at the rated efficiency yet at a reduced airflow. This
will affect the ability of the machine to provide positive or negative pressure within the
containment.
To replace the HEPA filter unplug the machine and remove the screen/manifold to
remove the prefilter. You will see 4 filter tabs holding the HEPA filter in place (see photo).
These tabs are secured with 1/4-20 Nylock nuts, which require a 7/16” wrench or socket.
Remove all 4 filter tab retaining nuts and remove the filter tabs and set aside. Slide the HEPA filter out along the
filter guides and remove it from the machine. ALWAYS TREAT THE USED HEPA FILTER AS HAZMAT AND PROCESS IT
ACCORDING TO YOUR ESTABLISHED HAZMAT PROCEDURES.
To replace the HEPA filter ensure that the gasket on the HEPA filter faces inwards toward the flange, slide the filter
in place along the filter guides and re-install the filter tabs and filter tab securing nuts. The nuts should initially be
tightened to where the stud is flush with the end of the nut. This will compress the gasket on the filter approximately 1/2
of the thickness. This allows for the filter to be reseated and tightened at a later time if necessary.
Bag Filter Replacement
For the projects that do not require a HEPA filter, the economical bag filter can be used to control the dust at
construction sites. The bag filter housing can be installed in place of the HEPA filter. The Bag filter with a MERV 15
rating and multi pocket configuration has a large dust holding capacity and require replacement when the airflow
filter tab
