Cabin intake location for lysol clean
 

I know our trucks don't have cabin air filters. I almost always use recirc a/c and never had an issue. I was thinking of doing the lysol spray trick to clean out the evap system. Can anyone confirm which side the cabin intake is on? Is there a driver's and passenger intake or just one location? Hopefully I will be able to feel from the cowl, I'd rather not take it off to confirm. Thanks.