Can you have an open fire when using the spark screen?

Hello, per the manual "This insert has been tested for use with an open door in conjunction with a fire screen, sold separately. The fire screen must be properly secured on the insert to avoid any risk of sparks damaging the flooring. When the fire screen is in use, do not leave the insert unattended to respond promptly in the event of smoke spillage into the room. If you have any further questions please feel free to give us a call! Thank you.