If your oven is vented inside, the charcoal filter should be replaced every 6 to 12 months, and more often if necessary. The charcoal filter cannot be cleaned. To order a new charcoal filter, contact an LG Customer Information Center or visit the lg.com website.
Place your finger in the groove, push back, and pull down to remove the grease filter.
Groove
Knob
Remove the old charcoal filter.
Slide a new charcoal filter into place.
To reinstall the grease filter, insert the back of the filter, push the filter toward the back, and lift the filter up into place.