HEAD - FIG. NO. 4 -f f- SILL - FIG. NO.3 plain outline. Details above show SSB glazing. Optional double glazingpanels are shown in Fig. No. 2 and No. 4. Detail below, Fig. 8 shows glazing with ^4 insulating glass. The completely assembled basic unitsare shown heavily cross-hatched. Exterior and… … SILL- FIG.NO.6CONVERTIBLE DETAIL— Same as Ventilator detailexcept no operating hardware and screen. Stops ^ x 1^shown in Fig. 1, are used also on sides and bottom of Con-vertible units in place of operator covers.