The instrument panel vent air flow can be directed up/down or left/right using the vent adjustment lever.
The air flow can also be closed using the vent adjustment lever. To close the instrument panel vents, slide the vent adjustment lever to the LEFT until it clicks.
Hyundai Elantra AD (2016-2020) Owners Manual: Starting the engine
WARNING
Always wear appropriate shoes when operating your vehicle.
Unsuitable shoes, such as high heels, ski boots, sandals, flipflops, etc., may
interfere with your ability to use the brake and accelerator pedals.
Vehicle with manual transmission:
1. Make sure the parking brake is applied.
2 ...
Hyundai Elantra AD (2016-2020) Service Manual: Specifications
Specifications
Audio
ItemsAudioModelTFT/MONO/DISPLAY Power supplyDC 14.4VParasitic currentMax. 1mA (Head unit only)Antenna80PF 75?Tuning typePLL SYNTHESIZED TUNING
...