Carpenter Red Seal Exam Prep · Question
An architect specifies that all soffit vents must meet a net free area (NFA) of 258 cm² per lineal metre. The building has 45 lineal metres of soffit. How many 150 mm x 400 mm rectangular soffit vents, each with a stated NFA of 120 cm², are required?
Required total NFA = 45 m * 258 cm²/m = 11,610 cm². Number of vents = Total NFA / NFA per vent = 11,610 cm² / 120 cm² = 96.75. Since you cannot have a fraction
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Question: An architect specifies that all soffit vents must meet a net free area (NFA) of 258 cm² per lineal metre. The building has 45 lineal metres of soffit. How many 150 mm x 400 mm rectangular soffit vents, each with a stated NFA of 120 cm², are required?
Answer options:
- 86 vents ✅ 97 vents
- 102 vents
- 115 vents
Correct answer: 97 vents
Explanation: Required total NFA = 45 m * 258 cm²/m = 11,610 cm². Number of vents = Total NFA / NFA per vent = 11,610 cm² / 120 cm² = 96.75. Since you cannot have a fraction of a vent, you must round up to the next whole number, which is 97 vents.
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