DRAFT INDUCER 10inch DI-3. This is the draft inducer that you would use on a 10" inner diameter chimney. We also carry a single wall pipe 70348 with the hole already cut out for this draft inducer. This model would be used on the Clean Burn CB 5000 waste oil furnace or the CB 500 CTB boiler. And could be used on any waste oil furnace that has a 10" inner diameter chimney pipe.