I doubt one could force 30lbs of anthracite coal through it a day with the draft wide open.
That would depend on the size of the bucket of coal you would use. They are called a bucket a day that is what you can expect to burn threw one . Most of the coal ash buckets or coal scuttle or hod whatever you would like to call it.
will hold 22 to 30 lbs depending on the size . You can burn threw 30lbs in 24 hr easy more in the middel of winter they are not air tight units.Try the links below for firebricks . They will also have oval to round flue pipe adaptor
This link is broken, either the page no longer exists or there is some other issue like a typo.http://www.hearthstove.com/catalog.htmlhttp://www.woodmanspartsplus.com/68/cat ... rence.html