therma-stor-products-grou ts-261b 사용자 설명서

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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