HVAC new systems

I run into this system for the second time.
Is it possible to inspect this system. I was not able to find a way to open it up.
Can you give me an idea?

Thank you how about the furnace?

Why do you want to open it ?
Going to check the circuit board ?

So is this case I can only check the air filter for the furnace?

Where is the furnace? All I can see from your pics is what looks like water to air heat exchanger. Check filter, check water lines for leaks, operate and check for heat.

Love the dryer venting !