A break zone is a deliberate gap between the forward edge of the infusion mesh and the outlet port. A gap of between 10 and 20 mm's is usually sufficient between the mesh and another strip of mesh running the width of the part placed under the outlet connector. This acts to slow down the flow of resin in front of the connector to allow for full wetting-out of the furthest reaches of the part before resin starts to flow up the tube and can allow any air in the resin to be evacuated more fully across the part.
If the area around the outlet port is fully enclosed by resin and the furthest reaches are still infusing, this can make it hard for any air still in the resin to evacuate fully.
As the resin flow can lag behind the areas closest to the inlet port, especially on wider parts, extra strips of mesh can be placed over the main piece at the widest points to help speed things up a little. This can be useful where ambient temperatures a little cooler than normal, especially
I sometimes make parts of a similar dimension to the one you mentioned and tend to trim the mesh so that there's only enough to cover the first 20 mm's or so in the area closest to the inlet connector, which helps to make sure the parts wet-out fairly evenly