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5 Cards in this Set
- Front
- Back
Class A |
Have large quantities of air flowing past regular arrangements of similarly shaped obstructions |
|
Class B |
Have large quantities of air flowing past regular arrangements of similarly shaped obstructions |
|
Class C |
Have relatively low airflow through them |
|
Class D |
Have very little or no airflow |
|
Class X |
Have large quantities of air flowing through them and are of unusual construction |