. Class (any type may be used including
wired and pattemed);
. Spacer bar - maintains the space between
the panes and contains desiccant to keep the
air or other gas dryi
. Desiccant - absorbs any small amount of
residual moisture from the air space;
. Seal(s) - prevents moisture fiom entering
the unit cavity and holds the unit together;
. Dried air or other gas - lack of moisture
vapour eliminates the risk of condensation in the cavity; dry gases are better insulators than moist ones.