An adjustable air block for routing cables includes a housing, a first inner plate, and a second inner plate. The housing includes a central gate extending between a top end and a bottom end thereof. The first inner plate and the second inner plate are fastened at the top end of the housing. The first inner plate includes a first vertical portion adjustably coupled to a left edge of the central gate along a first inner surface. The second inner plate includes a second vertical portion adjustably coupled to a right edge of the central gate along a second inner surface.