Product review (4 stars): Original product replacement.
I bought my LG refrigerator from Lowe's but they do not stock the fresh air filter that is supposed to be changed every 6 months along with the water filter.  Home Depot supposedly stocks it in my local store but they could not find it.  So back to the old reliable of Amazon.  It was a direct replacement.  I am not sure why it should cost $20.00 for a small charcoal filter but it was still cheaper than Home Depot, even if they could have found it.