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