Warm Morning-Model 617

Hello,

Does anyone have a photo or description on how the firebrick should be installed when rebuilding a Model 617 stove. Specifically I'm interested in the corner firebricks. I understand about the flues allowing the blue flame into the corners. My question is the space between the upper and lower firebrick. Should there be a space or should the brick be placed so that no space exists?

Thanks,
Petey/Marvin