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The mesh is going onto an adapter that is circular and 4 inches in diameter. By placing the mesh onto the exterior of the circular ring and making it flush (by bending parts of the wire mesh) and keeping them in place with materials like zip ties, the mesh will be in correct position. Once in correct position, remove zip ties and place 4 inch duct over circular part of the adapter. Use the stainless steel duct clamps that come comes with the duct and secure both the duct and the flushed out mesh by tightening the clamp screw. If the clamp is not strong enough to make sure the mesh is secure 100%, either use automotive goop or double sided foam tape to secure the mesh onto the circular ring of the adapter before placing the duct over it.