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| Model Family | Shape | Fill | Fill Protection | Length/Thickness | Sound Transmission Class | Flame Spread | Smoke developed | Pressure (in.wg.) | High Transmission Loss (HTL) Casings | Connections | 304 Stainless Steel Option | 316 Stainless Steel Option | ||||
| STC-40 | Rectangular | Fiberglass, Recycled Cotton | None | 72 | 40 | 25 | 50 | 8 | 10 | Slip, S&Drive, Flange |
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| STC-45 | Rectangular | Fiberglass, Recycled Cotton | None | 96 | 45 | 25 | 50 | 8 | 10 | Slip, S&Drive, Flange |
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| STC-50 | Rectangular | Fiberglass, Recycled Cotton | None | 120 | 50 | 25 | 50 | 8 | 18/18 Double Wall | Slip, S&Drive, Flange |
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| Type L | L | Fiberglass | None | 18-48 | - | 25 | 50 | 2 | - | - |
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| Type U | U | Fiberglass | None | 18-48 | - | 25 | 50 | 2 | - | - |
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| Type Z | Z | Fiberglass | None | 18-48 | - | 25 | 50 | 2 | - | - |
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| RA | Rectangular | Fiberglass | None | 4 | - | 25 | 50 | 2 | - | - |
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