As the last person said, the bottom half of the laptop serves as the intake and most of the exhaust is out the back. There is a side exhaust port on the right side of the laptop. You will feel the hot air blow on your thumb if you are using a mouse. But, you will only notice this if the system is working hard to cool.
There is a graphic on HP Omen's site that shows the intake and exhaust.
Go to this link: https://www.omen.com/us/en/laptops/2020-omen-15-intel.html
The information you are looking for is half way down the page. The Intel and AMD models share the same cooling solution.