The Hawthorne I is a fully standard option. Match your fireplace to the opening and the rest is taken care of. The Hawthorne II allows for customization in the frame, allowing you to make the frame smaller. The Hawthorne has customized handles unique to its line only. The bi-fold doors allow you to access your fire with ease. The Hawthorne I includes sliding mesh, however it is optional for the Hawthorne II.