There's no need for external framing or shutters since this unit installs from inside the wall
Cutting Attachment Manufacturer Part Number CA2460
Aromatic and Halogenated Compounds
Boiling Point 180 Degrees F
Application Bush
Apollo 1060534 Safety Relief Valve Bronze, FNPT, FNPT, 1 in Inlet Size, 1 in Outlet Size, 15 to 160 psi G0168052 There's no need for externalSafety Relief Valve, Body Material Bronze, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 1 in, Outlet Size 1 in, Factory Set Pressure 150 psi, Pressure Range 15 to 160 psi, 5,044,000 BtuH, Disc Material Brass ASTM B16, Overall Height 6 11 16 in, Application Hot Water Heating Boilers and Hot Water Supply Systems, Overall Length 4 in, Seat Material Silicone, Spring Material Plated Alloy Steel, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Yes,