Eight Foot Rumford Plans
You'll notice that on a couple of plans we sloped the fireback. We hate to do that after arguing elsewhere that "real Rumfords have straight backs", but we thought we had a problem. Our segmented throat tiles are designed for a 36" Rumford. We can make do in the larger Rumford designs by using the Vestal damper to help bridge the too big throat. In our six foot Rumford we move the whole throat assembly back 4". But we thought the seven and eight foot Rumfords were just too big. We wished we had a larger throat tile with a bigger radius curve for these big Rumfords but we don't. So we swallowed hard and slope the fireback to help close down the throat opening far enough for a Vestal damper to fit.
More recently we made a couple of seven and eight foot Rumfords with straight backs anyway because it was easier to make the panelized fireboxes if the firebacks were straight. And the fireplaces worked fine.
So we have presented several variations of seven and eight foot wide Rumfords on this page. Click on the image to make it larger. If you slope the fireback don't slope it much. You can vary the width and height of the firebox so long as the flue size is at least ten percent of the opening area. And we like to stay close to the Rumford formula that the depth and width of the fireback are about equal and at least one third of the fireplace width. Also be sure that the net throat opening is about one fifteenth the area of the opening. We can design the throat to be as small as one twentieth of the fireplace opening size with good streamlining but the Vestal dampers are a little abrupt and restrictive.
You can leave out the Vestal damper and allow the throat opening to be quite large and the fireplace will draw fine - it just won't be as efficient. Use a chimney top damper or, outside where you don't care about wasting outside air up the chimney, use no damper at all.
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Buckley Rumford Fireplaces
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