Measure the opening sizes and cut the head, sill and jamb sections. Miter or cope and butt the joints at the head. Cope and butt joints at the sill. When measuring the frames, take into account the caulking bead clearance requirements and shim with the appropriate-sized horseshoe-type plastic glazing shim. Expansion properties of the aluminum frame should be taken into consideration. To attach the aluminum frames to the structure, place all fasteners about 12 to 18 inches on center or as recommended by the engineer of record. Fasteners should be no closer than 6 inches from the corner joints. Couple frame members exceeding 24 feet in length with an expansion joint material. The specific type of fastener required depends on whether the supporting structure is concrete, steel or wood. At all head/jamb mitered corner joints, install aluminum corner keys and internally seal corners with approved silicone. At sill/jamb coped and butted corner joints, a screw boss is provided for corner assembly. After assembly, care must be taken to internally seal all joints. Cut and fit plastic inserts into the head, jamb and sill sections of the frame. The vinyl inserts at the jamb should be fitted to the full daylight height of the opening and clipped securely into the frame. The horizontal head and sill vinyl comes pre-cut to length to match the glass sizes and should be place intermittently—to match glass placements—in the sill and head of the frame.  Finally, insert foam baffles into exterior weep holes. Before installation, clean all internal surfaces of the glass with an alcohol-based glass cleaner. Apply the 166 flange gaskets on each flange of every channel. The gasket application is most effective if the material is stored in a shaded location before installation. The gasket should be held 1⁄2 inch from the end of the flange on one end and flush with the edge of the flange on the opposite end. For instance, a 96-inch channel would have a 951⁄2-inch 166 flange gasket. The recessed portion of the gasket is always applied to the bottom end of the channel. Installation of the glass channels can begin at either the center point of the opening or at either end. The jamb channels at either end of the glazed opening must have minimum glass coverage of 3⁄4 inch or as otherwise specified. The flange cut/jamb channels are typically inserted prior to the installation of the last full-size channel. Pocket glaze the channels by inserting into the plastic liners in the head and then lowering the glass down onto the corresponding plastic insert in the sill. Suction cups are typically used to aid with this procedure. To ensure that the spacing between the channels is consistent, place 1⁄8-inch plastic shims at the head and sill of each channel as it is being installed.