Why does Acucraft Fireplace System require doors while other fireplaces have screens?

Acucraft Fireplace Systems are designed to be used as a heating system for your home. The airtight doors are a crucial part of the overall system. The doors work by sealing the fireplace which eliminates heat loss and allows you to completely control your fire. Acucraft does design a Fireplace Screen which you can add to any order and can be used when you are looking for that open hearth feel.