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| Hard Surface Classroom |
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| Black arrows represent direct sound, with a clear path from teacher to student. Red arrows represent reflected sound. Note
the many red arrows which indicate the longer, more indirect paths taken to reach the student. |
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| Acoustically Treated Classroom |
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| The addition of sound absorbing materials reduces late arriving reflected sound, lowers reverberation time, and improves speech
intelligibility. |
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| Direct Lighting |
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Traditionally high operating costs |
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Annoying visual interferences - glare and/or harsh shadows - which seriously affect occupant comfort and effectiveness |
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| Indirect Lighting |
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Brighter, more uniform illumination - especially with a high LR ceiling (Armstrong) |
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Reduced operating and maintenance costs - fewer fixtures are required for the same level of useable lighting |
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Reduced glare and softer shadows - less eyestrains |
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- Reduce noise and reflected sound
- Sound attenuation
- Humidity resistance
- Light reflectance
- Fire reaction
- Impact resistance
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- Chemical resistance
- Stain resistance
- Accessibility and demountability
- Economical
- Environmental protection
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