Answer :
In an open Panel Systems, the inside surface of the wall is left exposed so plumbing, insulation, and interior finishes can be applied at the job-site.
What is an open panel systems?
This refers to the outside surface of the exterior wall panel that is covered with sheathing or insulation board. It is the structurally engineered panels that form the inside load-bearing leaf of the external wall, comprising studs, rails, sheathing on one face and a breather membrane.
While the open panel system is like closed panel system being quick and easy to install providing a weather tight structure within a matter of days, the inside surface of the wall is left exposed so plumbing, insulation, and interior finishes can be applied at the job-site.
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