Hyundai Elantra N Owner's Manual page 442

Maintenance
Information
If the vehicle is operated in extremely
dusty or sandy areas, replace the element
more often than the usual recommended
intervals (refer to "Maintenance Under
Severe Usage Conditions" in this chapter).
NOTICE
Do not drive with the air cleaner filter
removed. This will result in excessive
engine wear.
When removing the air cleaner filter,
be careful that dust or dirt does not
enter the air intake, or damage may
result.
Use HYUNDAI genuine parts or the
equivalent specified for your vehicle.
Use of parts without the matching
quality could damage the air flow
sensor.
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