The first step in filter selection is to determine what the objective is for the filtration system. What is the ‘target’ particle size for the application? As an example the ‘target’ particle size in most health care facilities is one micron because 99% of all known bacteria are one micron larger.

Once the objective has been determined our ASHRAE 52.2 Test Report will be useful in determining which MERV efficiency will remove the target size particles. More detailed efficiency numbers can be found in the ASHRAE 52.2 Test Report. Filters with a MERV 13 and higher typically utilize a prefilter to maximize their service life and minimize cost.

Tri-Dim can help in the process of filter selection by having one of our factory-trained sales representatives assist in the process of identifying the ‘target’ particle size and then develop those identified objectives into a filtration protocol. Tri-Dim offers this service free of charge.

Tri-Dim Category A
Cleanrooms, Radioactive materials, Pharmaceutical manufacturing, Carcinogenic materials Orthopedic surgery

Tri-Dim Category B
Hospital inpatient care, General surgery, Smoking lounges, Superior commercial buildings

Tri-Dim Category C
Superior residential, Better commercial buildings, Hospital laboratories

Tri-Dim Category D
Commercial buildings, Better residential, Industrial workplaces, Paint booth inlet air

Tri-Dim Category E
Minimum filtration, Residential, Window air conditioners