
There is no arrow on the element to indicate the air flow direction. Just the serial number, which I suspected would be shown right side up, which might be right. All the videos on You Tube stressed the importance of proper airflow placement. I had to cut a hole because the 2015 2500 didn't have a cabin air filter and immediately stopped because there was no arrow on the element. I am not impressed and will not be ordering from this supplier again next time I need to replace a filter. Any tips on how to tell if it's installed correctly?

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