Dual glazing panel system

A panel unit assembly comprising:

• interlocked first and second engagement members each having panel-attachment members for retaining portions of the panels;
• two pairs of opposed transparent or translucent panels with retaining portions attached to the panel-attachment members of the first and second engagement members and an airspace disposed between the panels forming adjacent interlocked panel units;
• the first engagement member having a first wall disposed between the first pair of panels and a male member projecting from the first wall, the male member including catch rails on opposite sides of the male member;
• the second engagement member having a second wall disposed between the panels and a pair of sidewalls defining an interlock cavity for receiving the male member;
• and
• the catch rails being disposed adjacent to an inner surface of the sidewalls to engage the sidewall inner surfaces and limit pivoting movement of the panels, where at least one inside surface of the sidewalls of the interlock cavity includes serrations positioned for engagement with the distal edges of a catch rail when the engagement members pivot with respect to each other.

A pair of engagement members for forming a panel unit assembly comprising:

• first and second engagement members having opposed panel-attachment members for retaining portions of opposed transparent or translucent panels;
• the first engagement member having a first wall disposed between its opposed panel-attachment members and a male member projecting from the first wall, the male member including at least one catch rail;
• and
• the second engagement member having a second wall disposed between its opposed panel-attachment members and a pair of sidewalls defining an interlock cavity for receiving the male member,
• the catch rail being disposed on the male member to engage an inner surface of a sidewall of the interlock cavity of the second engagement member to limit pivoting movement between first and second engagement members when they are engaged.