Aprilaire 5000 Filter Frame Assembly 4308. The black plastic filter frame has an overall size measuring 27 x 16¾ x 7½".
The filter frame comes with:
Pleat Spacers 4270 (Qty 6)
Filter Seals (pink insulation)
Used in all model 5000, from the first model to present. This assembly is ready to snap on to ionizer frame 4598, install 501 filter, and run.