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TM-2

 and TM-4

 Ceiling Filter Modules

Operation

Once in position, the modules may be balanced and tested.

1. 

Adjust the main air supply duct system for total design air 

volume before attempting to balance any of the filter  

modules.

2. 

On units equipped with an adjustable damper-diffuser,  

access by removing the well nut plug and inserting a #4  

Phillips screwdriver.

3. 

On units equipped with an adjustable damper-diffuser, 

adjust as required in conjunction with the system branch 

duct damper to provide the desired air volume. 

 

NOTE: The adjustable disc type damper-diffuser is a trim 

device and is not intended to induce a large pressure drop.

4. 

Reinstall the well nut plug into the diffuser adjustment port.

5.

 Determine the actual total air volume (in CFM) through 

each module by using a soft balancing hood equipped 

with a velometer.  

Testing

1. 

The modules may be leak tested in place.

2. 

AAF Flanders does not recommend introducing a  

challenge aerosol through the port in the face of the filter. 

The 

7

16

″ diameter port is too small for proper mixing, and 

the challenge aerosol may condense on the diffuser  

plate, eventually dripping down onto the media pack. 

 

NOTE: The same port is used for both diffuser adjustment 

and for insertion of a probe to measure the contamination 

level of the supply air.

3. 

AAF Flanders recommends that the challenge aerosol be 

introduced into the ductwork at least ten duct diameters 

upstream from the module, or preferably into the fan  

intake. The port in the face of the filter may be used to 

check the contamination level of the supply air at any time.

4.

 Your AAF Flanders representative can offer several  

alternative suggestions and techniques on testing. Contact 

AAF Flanders Customer Service toll free at 877.228.7007 

for assistance.

Maintenance

TM Series modules need no maintenance. When installed 

downstream of a good system of AAF Flanders prefilters 

(90% AHSRAE efficiency recommended), they should provide 

years of service.
A periodic (annual) check of airflow is recommended. The 

modules should be changed when the desired airflow is 

no longer achieved due to accumulated dirt buildup on the 

filters, which increases resistance. Discard the entire module 

and replace with new units.

Typical TM module installation

9920 Corporate Campus Drive, Suite 2200, Louisville, KY 40223-5690

888.223.2003  Fax 888.223.6500  |  aafintl.com 

 

AAF Flanders has a policy of continuous product 

research and improvement and reserves the right to 

change design and specifications without notice.

ISO Certified Firm                    

©2017 AAF International and its affiliated companies.

AFP-3-475D    01/17

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