Jenn-Air Gas Downdraft Cooktop JGD8130ADB Black 4 Burner w/ Vent Fan WORKING. Up for sale is a Jenn-Air gas downdraft cooktop, model JGD8130ADB, in black. This unit features a built-in downdraft ventilation system and 4 gas burners, making it a great replacement or upgrade for kitchen installations requiring integrated ventilation. Type: Gas Cooktop with Downdraft Vent. Built-in downdraft fan system. Standard household plug for vent fan. Includes grates and burner caps. Tested and working prior to removal. Normal cosmetic wear from use. IMPORTANT: One burner control knob has a small melted area (see close-up photo). The knob is still usable but may need replacement for cosmetic perfection. ? What’s Included. Burner grates & caps. Control knobs (including the one with damage). No additional parts or accessories included.