Item duplication. 1  Step 1. Have the block you want to duplicate in front of you. ( 2 Examples: Diamond, Gold, or Iron.). 3  Step 2. 4  Now you might want to have a Iron pickaxe or Diamond pickaxe. 5  Step 3. Use you'r pickaxe to quickly mine it.
Heavy Duty/Industrial. A backdraft damper is an isolation damper allowing air in one direction only. Greenheck's HB damper series is designed to prevent back flow at static pressures and velocities up to 20 in. wg and 6400 fpm, respectively.
1. damper-a movable iron plate that regulates the draft in a stove or chimney or furnace. chimney-a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building. plate-a sheet of metal or wood or glass or plastic.