I will be transiting in Hong Kong for around 18 hours and would like to know more on what the procedure is with the use of lounge access and then being able to exit the airport to HKG downturn.

I want to use the lounge facility at HKIA for a few hours and then go to downturn Hong Kong after that.

Can I go to the lounge and then exit the airport terminal?

I will check in through to my final destination and therefore I will have a boarding pass for my onward travel from Hong Kong.

Any advise is much appreciate!