Adjustable filter frame and grid

A grid for holding a filter within a frame having a width and a length, the grid comprising:

• a plurality of intersecting members extending across at least one of the length and width of the frame, each of said members having first and second ends;
• and
• at least two indentations in at least one of said plurality of intersecting members, one of said indentations being proximate said first end of said one member and a second one of said indentations being proximate said second end of said one member so that the frame engages said indentations proximate said first and second ends of said one member to secure the filter within the frame and grid.

A filter frame and grid system, comprising:

• a frame having a first channel member and a second channel member, each of said first and second channel members having a U-shaped side wall terminating in a flange, said first and second channel members slidingly connected to each other to form a frame having a length and width, said frame being adjustable in one of said length and width;
• and
• a grid comprising a first member extending across at least one of said length and width of said frame, said first member having first and second ends and first and second interlocks, said first interlock being proximate said first end and said second interlock being proximate said second end so that said flanges engage said first and second interlocks to secure said frame to said first member in said one of said length and width.

A filter frame and grid system, comprising:

• a frame having first and second right angle channel members having a U-shaped side wall terminating in a flange and third and fourth right angle channel members having a U-shaped side wall, said third and fourth right angle channel members slidingly connected to said first and second right angle channel members to form a frame having a length and width and being adjustable in both said length and width;
• and
• a grid comprising a first member extending across at least one of said length and width of said frame, said first member having first and second ends and first and second interlocks, said first interlock proximate said first end and said second interlock proximate said second end so that said flanges engage said first and second interlocks to secure said frame to said first member in at least one of said length and width.