... Door Production Line, Wall Board (Sandwich Wall Board) Production Line, Vent-pipe Board Production Line and Roof Tile Production Line. The above ... Board, Straw Board, Straw Door, wall board(Sandwich Wall Board), vent-pipe board and Roof Tile. Detailed Product Description fire-resistant board ... day is that: 400 pieces×24.1 Yuan/ Piece=9640Yuan vent-pipe board production line