BACross® Crossflow Fill is the original equipment fill used by BAC in the FXT and Series 1500 model lines and in the Series 3000 model lines sold through 2001. It is a very efficient heat transfer design that maximizes air and water contact and continues to offer significant thermal performance advantages over other fill designs such as glued bundles. When used in BAC towers, it will maintain the thermal performance as certified by the CTI. BAC offers single-source responsibility, providing quality materials in a kit complete with all hardware and supports, ensuring a guaranteed perfect fit.