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.
Damper. 1  A means of controlling the flow of air into a stove. Usually, a damper was a plate that could be slid across air openings, but the damper in a stovepipe was a metal disk mounted inside the pipe that could be turned from being parallel to the airflow to being perpendicular, completely cutting off air flow. 2  slightly wet.