Another item that may occasionally need replacement on Omega Super Chromega C, D and E Dichroic enlargers is the IR filters on the side of the mixing boxes. These filters normally should last the life of the enlarger, but we do sometimes see mixing boxes with these filters broken or missing altogether. The infrared filter is necessary because it prevents the transfer of heat into the mixing box which will quickly damage the styrofoam liners. If the filter on your mixing box is missing or the glass is broken, this is the proper replacement. For all C-A, C-C, D-D, D-B, E-E, E-D, and E-B mixing chambers.