Dual Blower Kits - found at - LUWA: Distributor of Superior Appliances by Design
Dual Blower 8" Round Rear Vent Kit-VKIT-8R
Dual Blower 8" Rectangular Rear Vent Kit-VKIT-8RECR
Dual Blower 8" Round Low Pitch Roof Vent Kit-VKIT-8LP
Dual Blower 8" Round High Pitch Roof Vent Kit-VKIT-8HP