Astria 10 Packs Flexible Horizontal Firestops SF4.5HF-10Astria 10 Packs Flexible Horizontal Firestops SF4. 5HF 10 Product Details What advantages do the Astria 10 Packs Flexible Horizontal Firestops offer in a direct vent system, particularly concerning safety, flexibility, and compliance with building codes? The Astria 10 Packs Flexible Horizontal Firestops offer several advantages in a direct vent system, particularly concerning safety, flexibility, and compliance with building codes. These firestops
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