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Olympic DD12 Front Loading Gas Kiln

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MSRP: $10,015.00
Price: $9,015.00
You Save: $1,000.00
Manufacturer: Olympic Kilns
Part No: DD12

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Olympic Kilns builds powerful gas production kilns for potters and businesses. Users are provided with equipment that handles large capacity loads with ease, and best of all, is affordable.

Comparing gas to electric kilns is similar to comparing sports cars to sedans. Both will get you where you need to go but the ride is definitely different. Gas kilns are the sports car of kilns. They fire to high temperatures, are high powered and provide the capability to do techniques that cannot be duplicated in an electric kiln such as reduction. Downdrafts have a more complex system than updraft kilns in that their exhaust and intake is at the bottom. These kilns require a chimney or stack to induce enough draft to pull in fresh air for combustion.Olympic builds downdraft kilns as front-loaders and front-loading car designs for convenient loading and unloading.

The DownDraft 12 furniture kit includes 4 layers of shelving - 8 each of 13" x 26" x 1" rectangle shelves, 8 each of 3, 6, 9, 12-inch large square posts, and a 5 lb. bag of kiln wash. 

Specific Kiln Information

Model  DownDraft - DD12
Inside Setting Area (w x d x h) inches  27 x 28 x 31
Inside Volume  18.75
Inside Dimensions (w x d x h) inches  33 x 32 x 37
Cubic Feet  12.1
Outside Dimensions (w x d x h) inches  50 x 59 x 73
Brick Thickness  4.5" + 1" Fiber
Maximum Temperature Cone 10-2350°F/1288°C
BTUs x 1,000  25
BTU/HR Total  150,000
Gas Pipe Inside Dimensions  1"
Propane (LP) Water Column Pressure 11" 
Natural Gas (NG) Water Column Pressure  7"
No. of Burners  6
Orifice Size LP #40 
Orifice Size NG 9/64 
# of Gallons LP per Cone 10 Firing  15
Est. Ship Wt (lbs)  1,800

Olympic DownDrafts Construction

The DownDraft kiln’s exhaust, as well as intake, is at the bottom. DownDrafts require a chimney or stack to induce enough draft to pull in fresh air for combustion. Olympic DownDrafts fire to cone 10, 2350° F and can be built of brick or fiber. Fiber walls allow the kiln to heat up and cool down faster than brick walls, which are designed for a slower cooling down and heating up firing. 

The frames of the Olympic downdraft gas car kilns are built of heavy angle iron and metal tubing. Kiln walls are 4 ½” insulating brick with 1” ceramic fiberboard and 1” air space created by the tube frame. The exterior of the downdraft kilns are durable stainless steel. Fiber and brick DownDrafts are built with double insulated floors, consisting of brick and ceramic fiberboard. The additional strength and insulation enables the kiln to fire at high temperatures, and to maintain temperatures, without damage or deterioration. The roofs of the Olympic DownDrafts are designed with bolt in pyro-block modules for energy efficiency and easy repairs. The DownDraft car kilns have a heavy gauge iron track for rolling the kiln floor and door in and out of the kiln chamber. 

Olympic DownDrafts are built with high efficiency venturi burners that are underneath the kiln chamber and have an option of being built on the side of the kiln chamber. Forced air burners are an available option. Olympic DownDraft gas kilns come fully assembled ready to fire and are shipped with peephole plugs, instruction manual, and warranty card. One-year Limited Kiln warranty.

dd ignition system


Options for the DownDraft kilns include:

- Pyrometer, analog or digital, which will display the kiln’s temperature during a firing.

- The digital High Limit Controller provides a digital temperature display while the kiln is firing and the kiln operator is able to program the controller to an end temperature for the kiln to shut-off when it reaches the target temperature. 120-volt outlet required for High Limit Controller. 

Note - The first layer of shelves must be 3” above the kiln floor for proper airflow. We recommend kiln shelves have a 1” space in the middle as you stack for proper airflow in the kiln. The direction of the shelves can be alternated from one level to another and ware can be placed on the 1” space between the shelves. The top layer of shelves may be less than 1” apart.

Venting Gas Kilns

Proper ventilation is required when firing a gas kiln. Gas kilns fired outside may not require a vent but any gas kiln fired indoors will require ventilation. When purchasing vents it is often best to choose a local HVAC or sheet metal manufacturer, or Olympic Kilns can build one for you. Vent dimensions need to be round or square in a cone shape and the bottom of the vent needs to be larger than the outside diameter of the kiln. Diameter at the top of the vent needs to be 10” discharging into a nonflammable exhaust pipe determined by building conditions or local codes. 

Stainless or galvanized steel vent hoods 48" x 48" are an available option for DownDraft gas kilns.


Receiving Your Kiln

Olympic Kilns packs its merchandise so that it will arrive at its destination undamaged. Olympic orders are FOB origin when they leave our loading dock. This means we hold the carrier's receipt that your order left in good condition. We do not allow any deductions from invoices for damaged ware. It is the receiver's responsibility to understand and comply with standard shipping and receiving practices as described in this section. The carrier is responsible for transporting your freight but not for unloading it. A lift gate is required if you do not have a loading dock for shipments delivered by freight carrier. UPS and FEDEX will deliver smaller shipments to your door. 

If you do not have a loading dock, a lift gate for transporting the freight from the truck to ground level is required upon delivery. You will need to request lift gate service when ordering your kiln from your Olympic dealer. Otherwise additional freight charges will be incurred upon delivery of freight. It is your responsibility to move the freight from the truck to its place of use. 

Lift gates are available for kilns on 6 ft. x 6 ft. pallets or smaller. Any Commercial Glass Fusing kiln and 20 cubic feet or larger Commercial Electric and Downdraft Gas models require the customer to have a forklift that can move the kiln from the truck to the desired location. If you do not have access to a forklift, check the internet or yellow pages for small moving companies that can take the freight off the long distance carrier and move the freight to the desired location. Give any prospective mover a physical description of the kiln, the weight, and inform them that it is designed to be picked up with a pallet truck or forklift only.

Forced Air Burners for DownDraft Kilns

Forced air burners with the output of 500,000 BTUs each provide excellent temperature and reduction uniformity as an option to the venturi burners. 120-volt outlet required.

Kiln Location

Adequate space - at least 12 inches of space between the kiln and the wall. All flammable materials such as curtains, plastics, etc. in the area of the kiln should be removed. 

Proper ventilation - if the kiln is located in a confined area it is essential that an exhaust hood be place above the kiln and vented to the outside. This ensures removal of heat and exhaust gases including carbon monoxide. Even if the kiln is outside be sure that the hot exhaust gases do not cause damage. 

A 120-volt outlet will needed if a High Limit  Electronic Controller is purchased with the kiln. 

If the kiln is to be placed outside, ensure that moisture is not permitted. Use a roof over the kiln or some type water resistant tarp when the kiln is not being fired. 

Because all kilns generate heat, the burner system/stand should be placed on a cement floor. Vinyl tiles or linoleum could be damaged without this precaution. It is important that the kiln be fired only on the metal stand or frame provided with the burner system. The eleven-inch height of the frame is necessary for proper burner positioning and adequate cooling beneath the kiln. Remember to use sheet metal or non-flammable material to shim the legs when leveling the kiln.

Kiln Installation

Assembly of Kiln
Olympic DownDraft kilns, front-loaders and car kiln models, are shipped ready to fire. There is no assembly of putting the kiln together, unless you have requested a custom kiln. If you have requested a custom order, example a DownDraft kiln with outside dimensions that cannot normally go through a 34 ½" door. If the door has to be taken off, or some other irregular situation is needed, contact Olympic Kilns before dismantling the kiln to maintain your warranty and to insure that no damage occurs to the kiln. A qualified individual needs to attach the gas supply to the kiln.

Gas Usage for DownDraft Kilns


Olympic gas kilns burners are factory set for use on either propane, or natural gas from a street main. If propane is used, your tank must have a low-pressure regulator like those on a camper or trailer. If an adjustable regulator is used approximately ¾ to 1 ½ pounds of pressure is necessary. The table below is the minimum size tank for a cone 10 firing for each DownDraft model. You need to purchase a larger tank than the cone 10 firing requirement so that the tank doesn’t need to be refilled after each firing.

A larger burner orifice in necessary when used on household gas pressure of six (6) to eight (8) inches of water column. If your kiln was ordered for use on household natural gas, it is equipped this way.



















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