| ETAR | equivalent tissue air ratio |
|---|---|
| FA | false aneurysm; Families Anonymous; Fanconi anemia; far advanced; fatty acid; febrile antigen; femor... |
| f/cc | fibers per cubic centimeter of air |
| HEPA | high-efficiency particulate air [filter] |
| HVAC | heating, ventilating, and air conditioning |
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