These models have a cell roller, a reinforced floor, cell roller ramp, and interior outlet. These models were designed to hold a 3, 5 or 7 tier Wheaton R2P cell roller.

Support braces have tracks to guide the cell roller wheels into the incubator. The cell roller ramp has small tabs at the end that fit into an opening at the end of each cell roller support brace.

The ramp is designed to support the weight of the cell roller as it is pushed into the incubator. Once the cell roller is pushed into the incubator, remove the ramp and save it in a convenient place should it need to be reused to remove the cell roller.