Astria Blackstone 36 inch Black Standard Bi-Fold Glass Door BDB36Astria Blackstone 36 Inch Black Standard Bi Fold Glass Door (BDB36) How does the Astria BDB36 bi fold glass door enhance fireplace safety and aesthetics? The Astria Blackstone 36 inch Black Standard Bi Fold Glass Door (BDB36) enhances both the safety and aesthetic appeal of your wood burning fireplace. Constructed from durable extruded aluminum, this door features a sleek black finish that complements various interior styles. Its bi fold design allows