Therma-Stor Products Group TS-261B - Manual (Page 4)

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2.5 Air Ducting
2.5A Inlet Ducting
Occasionally the area to be filtered is difficult to access
and/or the unit cannot be located in the area. In such
cases, the air can be ducted to the unit’s inlet.
A round 2” diameter flexible duct can be attached to the
unit inlet on top. It connects by placing the wire in the duct
under the four tabs on the top. It may be removed after
use for easier transport and storage. Flexible 2” duct is
available from Therma-Stor LLC.
2.5B Outlet Ducting
A detachable rectangular exhaust collar is supplied that
will allow 0” round lay-flat plastic duct to be attached to
the Phoenix Mini-Guardian HEPA System outlet. Lay-flat
plastic ducting is available from Therma-Stor LLC.
To attach ducting to a collar, remove the collar from the
unit by sliding the collar upward out of the guide. Put
the plastic duct end through the collar center. Roll the
duct end outward so that it over-laps the outside of the
collar. The duct will hook over the collar, preventing it from
slipping off.
2.6 Negative Air Ducting
The Phoenix Mini-Guardian HEPA System can be used
to filter and exhaust air from a space. By exhausting
to outside the space, the space will be under a slight
negative pressure. This will help prevent airborne particles
from leaving the space, since the negative pressure will
draw air in through openings in the space’s exterior.
The quantity of air exhausted depends on how the unit is
ducted and what speed is used. A duct can be directed
outside. Cover the other exhaust openings to direct all the
filtered air outside. This would result in up to 400 CFM
being exhausted on high speed and an equal amount of
fresh air being drawn in.
CAUTION: Exhausting too much air from a space with open
combustion devices (e.g. furnace, fireplace or water heater)
can cause those devices to backdraft. This can contaminate
the space with potentially fatal gases.
In such cases, the Phoenix Mini-Guardian HEPA System
must be used in one of the following three ways:
A. As a filtering unit only. Exhausting no air from the
space and thus causing no negative pressure or
backdrafting.
B. Exhausting a very limited amount of air which does not
cause backdrafting. In case B, the open combustion
devices must be thoroughly checked to guarantee that
they do not backdraft while the Phoenix Mini-Guardian
HEPA System is running.
C. Direct the outlet duct from the Mini-Guardian HEPA
System to the room with the open combustion
device(s). This will positively pressurize the room,
thus preventing backdrafting. As in case B, those
combustion devices must be checked after the Mini-
Guardian HEPA System is running to guarantee that
they are not backdrafting.
The duct can be directed outside, exhausting a portion of
the filtered air. The rest of the filtered air is recirculated
inside the space. Blocking the other supply holes will
determine the amount of air that is exhausted. By
adjusting the blocking plates over the supply openings, the
quantity exhausted can be adjusted down to no flow.
2.7 Power/Speed Control
The power/speed switch is located in the recessed cavity
on the unit front. When turned on to any speed, it powers
the impeller fan and hour meter.
Occasionally the impeller fan may not start on low speed.
If this occurs, rotate the speed control to high speed until
the impeller fan starts, then adjust it to a lower speed.
Figure 5: Inlet ducting
Figure 6: Outlet ducting