Elongated ceiling grid member and ceiling grid assembly including a plurality of the elongated ceiling grid member

A ceiling grid assembly comprising:

• a plurality of elongated ceiling grid members having ends, the ends being connected to form a grid of the plurality of elongated ceiling grid members, the elongated ceiling grid members having a longitudinal axis and comprising:
• an upper portion that includes a first pair of spaced and substantially parallel sidewalls that extend parallel to the longitudinal axis, the first pair of sidewalls having ridged interior surfaces that face each other;
• a lower portion that includes a second pair of spaced and substantially parallel sidewalls that extend parallel to the longitudinal axis;
• and
• a middle portion that connects the upper portion and the lower portion and is configured such that (1) an upper surface of the middle portion and the first pair of sidewalls define a top orifice and (2) a lower surface of the middle portion and the second pair of sidewalls define a bottom orifice;
• and
• a plurality of connectors for connecting the plurality of elongated ceiling grid members to form the grid of the plurality of elongated ceiling grid members;
• wherein:
• each sidewall of the second pair of sidewalls includes upper and lower ridged interior surfaces;
• the upper ridged interior surfaces are first parallel, opposing surfaces and the lower ridged interior surfaces are second parallel, opposing surfaces;
• the distance between the upper ridged interior surfaces perpendicular to the upper ridged interior surfaces is different than the distance between the lower ridged interior surfaces perpendicular to the lower ridged interior surfaces;
• each of the plurality of connectors has at least two arms;
• and
• each of the at least two arms (1) is above and parallel to the upper portion of one of the plurality of elongated ceiling grid members and (2) has at least one opening to receive a fastener to fasten the each of the at least two arms to the upper portion of the one of the plurality of elongated ceiling grid members.