Therma-Stor Products Group TS-261B - Manual (Page 6)

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Airflow on high speed with all filters clean and no ducting
is about 400 CFM. The unit can be run with very dirty
filters and virtually no flow without harming the unit. The
operator’s decision to change filters should be based on
filter cost vs. the unit’s filtering effectiveness. If airflow is
200 CFM vs. 400 CFM, the unit will filter particles from a
space at half the rate. The operator must judge if that is
acceptable.
If the operator determines the filters should be changed
due to low airflow, it is most economical to change them in
the following order:
Change the pad pre-filter (top) first. This is the least
expensive filter. Recheck the airflow. If the airflow is
acceptable, no other filters need to be changed.
Change the pleated fabric filter (middle) second. It is the
second least expensive filter. Recheck the airflow.
If acceptable, the HEPA filter does not need changing.
If the airflow is still too low, the HEPA filter must be
changed. To remove the HEPA filter, follow these steps:
. Loosen the two 3/8” thumbscrews that secure the
HEPA filter.
2. Push down on the filter hold-down bar and out on the
back of the cabinet to disengage the two “ears” from
the back of the cabinet. Rock the filter hold-down bar
up towards the front of the cabinet.
3. Disengage the screw and spacer from the hole in
the front of the cabinet and remove the filter hold-
down bar.
4. Lift the old filter straight up and out of the cabinet.
Place the new HEPA filter with the open side down,
into the cabinet. Be sure the four bumpers on the
base center it.
Figure 8: Loosen thumb screws
Figure 9: Push down on the filter hold-down bar
Figure 10: Disengage screw and spacer
Figure 11: Lift filter straight up