Fasten the substation unit in the wall -- preferably to a wall stud -- and attach the trim molding that surrounds the perimeter of the unit to hide the edges of the opening cut in the wall. Caution: If the master station connects directly to your home's electrical system, be sure to ...
If I were to do it again, I’d probably go with using the rigid Polyiso foam boards adhered with Great Stuff foam in the cans, and taking great care to have a means to push the insulation board against the van walls while the foam is curing, and using plenty of Great Stuff around ...