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- Any fiberglass with backing or vapor barrier
- Brown, bright orange or green fiberglass
- Wet or moldy fiberglass
- High density fiberglass or hard fiberglass
- Loose fiberglass, (blown insulation) or fiberglass dust
- Fiberglass contaminated with any hazardous materials, (asbestos, lead, cadmium, PCB's, etc.)
- Fiberglass with non-glass fiber material or hard material
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