Product IdentificationOnline version Match the product by Teri Halverson 1 Air Handling Unit Curbs 2 Roof Curbs 3 Manual Volume Dampers 4 Backdraft Damper 5 Adaptors 6 Hoods 7 Side Take-Offs Combination Curb AHU-1 AHU-1B AHU-2 Standard Curb AHU-3 MAU 1C -Canted C-2 Self Flashing C-2P Self Falshing Roof Equipment Platform C-3 Canted Step V4 Vented C-7 Extension CD-1 Parallel Blade CD-2 Opposed Blade CD-3 Single Blade Volume CD-5 Round CD-7 Air Foil DB-1 Heavy Duty BDD-1 Round BDD-2 Barometric Relief BDD-3 Fabric BDD-4 Vertical/Horizontal A-1 Square to Round A-2 Round to Round A-3 Square to Round with Side Inlet GRH- Gravity Relief GIH- Gravity Intake ST-1 HET ST-1HD Heavy Duty HET ST-2 Spin-In ST-2HD Heavy Duty Spin-In ST-3 Bell Mouth Spin-In