Olympic DownDraft gas kilns can be built with either brick or fiber walls. Fiber walls are chosen when faster heating and cooling times are needed and the brick walls are chosen for slower heating and cooling down rates. The frames of the Olympic DownDraft models are built of heavy angle iron and metal tubing and the thickness of the kiln walls contain 4 ½” insulating brick, 1” ceramic fiberboard and 1″ air space created by the tube frame. The binder in the ceramic board insulation will emit an odor during the first firing. This is normal and will not occur after the kiln has been fired for the first time.
In addition to the front loading DownDrafts, Olympic builds DownDraft Car kilns. The car kilns include a heavy gauge iron track for rolling the kiln floor and door in and out of the kiln chamber.