Open the motor/fan assembly on Aerus-Lux Legacy Model C15C3?

Now that I got the the clamshell opened up, I find the motor and fans are assembled inside a plastic canister with 4 tabs. I don't know which way to pry the tabs or what to do to get them to unlock. I don't want to break them off. I don't know if separating the two halves requires a little force or a little twist once the tabs are opened or does it fall apart like the clamshell did once I got the bumpers off.