Find the 36BDVT (Serial# B21A0 / SB B21B0 / SB) Majestic Gas Direct Vent Fireplace in the diagram listings shown below. Each diagram will take you direct to the 36BDVT (Serial# B21A0 / SB B21B0 / SB) Majestic Gas Direct Vent Fireplace repair part listings and part views for your model.