Check the listing for details. Harbor Freight Sand Blast Cabinet Air Flow Upgrades =1 baffle +1 blast gate. Condition: New. Listed at 39.88 USD. Greatly improve the airflow dynamics of your Harbor Freight or similar sand blast cabinet to achieve better visibility due to better control of the dusty air across the part being blasted. Kit comes with: 1) Adjustable blast gate - Precisely controls the amount of ambient air entering your blast cabinet so t. hat you can balance the inflow with the vacuum outflow. The blast gate has been modified to fit into the air inlet hole in the rear of your cabinet. Installs with a bead of caulk (you supply the caulk). 2) Custom formed, metal exhaust baffle - Pulls media and dust laden air from near your part being blasted when used with your vacuum system. Installs with bead of caulk and/or nuts/bolts (you supply). Ready to install. Please see our other items for more blast cabinet upgrades including our full upgrade kit (6 great mods will totally transform your stock blast cabinet into a professional level machine)