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ORTON Venting Solutions
What Engineers Need to Know

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Why is venting important?

     Ceramics are made from clays and other materials which produce undesirable fumes during firing. The primary fume is carbon monoxide. This is produced during the oxidation of organic material. Fumes can also contain sulfur oxides, hydrogen flouride and volatilized metals. These fumes are unhealthy and should not be breathed. Because gases expand when heated, the fumes will not stay inside the kiln unless the kiln is kept under negative pressure. From a health and safety standpoint, it is important to remove fumes from the work area.

What regulations am I dealing with?

OSHA Standards

     OSHA has set standards for carbon monoxide exposure of 35 ppm for long term exposure and 200 ppm for short term exposure. Independent testing has shown that these fumes can reach over 400 ppm near the kiln during firing.
In schools, many art teachers and some students working in rooms with unvented kilns complain of headaches, fatigue, sore throats and nausea. These are classic symptoms of carbon monoxide poisoning.

Uniform Mechanical Code

     The Uniform Mechanical Code (UMC) lists accepted venting methods. The downdraft vent system made by Orton is listed in the 1992 approved Code. 38 states recognize the UMC. 12 states recognize the Building Officials Code Administrative (BOCA). BOCA does not address downdraft venting in its code, but does allow it under a general section on venting.

State and Local Regulations

     Indoor venting requirements are being widely examined and regulated. The local and state health board, health department or industry, labor and human relations board should have current information. State Administrative Code can also be checked.
In some cases, regulations may refer to the EnviroVent as an example of an acceptable system. EnviroVent is a trade name used by one of Orton's licensees. EnviroVent uses the generic patented technology of the Orton system. Orton also has other licensees, but they use the Orton KilnVent or KilnVent II name.

What are the main issues to be considered?

There are two basic methods of venting. One is to vent the room. The other is to vent the kiln.

Venting the Room

     When venting the room, fumes are allowed to escape from the kiln into the classroom or workroom. Using an exhaust system, room air is exchanged with fresh make-up air. Considerable make-up air is needed to adequately remove fumes.

Venting the Kiln

     Two methods can be used to vent the kiln. A hood can be placed over the kiln, or a downdraft vent system can be used to keep the kiln under negative pressure. Gases are exhausted outside the building.
     The downdraft venting method is superior to hoods because it removes all of the fumes and requires less make-up air. Fumes are not released into the classroom or workroom. The downdraft vent also improves firing conditions inside the kiln.
With a hood system, fumes are released into the classroom or workroom before they are collected. The effectiveness of the hood depends on how close it is to the kiln and the volume of air being removed from the room. Rarely does a hood remove more than 85% of the fumes. Make-up air of more than 250 CFM is required.
     The downdraft system made by Orton and other manufacturers allows the kiln to remain closed throughout the firing. It also keeps the kiln under a slight negative pressure. This means all the fumes are exhausted and the air needed to fire the ceramics is brought into the kiln. This eliminates the practice of propping the lid of the kiln during early firing and removes a safety hazard created when closing the hot kiln lid.
      Both methods for venting a kiln can bring carbon monoxide to safe levels. However, the downdraft system is more effective in removing fumes, it improves firing by bringing air into the kiln and it usually costs less than hood systems. Made of stainless steel and equipped with a heavy duty blower, the Orton system will provide many years of service under normal operating conditions.

Why should I specify a local exhaust ventilation system like the Orton vent rather than a built-in engineered system?

     The Orton Vent is an engineered system. The venting method is patented and has become the venting standard in the United States and Canada.
     The cost for the Orton vent is low and the unit can easily be incorporated into the buildings central exhaust system. This is an advantage for today's budget and health conscious schools and businesses.

What are the costs associated with the Orton System?

     The low cost is one of the great things about the Orton vent. The cost for the vent is under $400. That includes 8' of ducting and other parts needed for installation.
      The cost to run the vent is about 1 cent an hour. For an 8 hour firing, that's only 8 cents to fire safely and remove fumes. Compared to hood systems, the Orton vent can save $1.00 a day for the needed make-up air.

What instillation requirements do I have to plan around?

     The Orton vent uses standard flexible aluminum dryer ducting. Up to 48 feet can be used without affecting the draw of the system. A single duct that expands to 8 feet is supplied. The ducting can be exhausted out a window or through an outside wall via a dryer vent flap. It can also be connected to an existing building exhaust system.
     Multiple vents can be connected using elbow connectors to a central duct. Our instruction manual illustrates how to do this and Orton can supply this information if needed for planning.

What are the specifications for the Orton vent-size, electrical, power etc.?

     There are five Orton systems available to fit nearly all venting requirements. The precise performance and operational specs for all Orton vent systems are listed in Orton's Descriptions and Specifications booklet.

     American Ceramic Supply staff and Orton's engineering staff can assist with specific installation issues or other techincal questions.

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American Ceramic Supply Company has been selling and servicing ceramic kilns to the ceramic industry, schools, individuals and studios for over 38 years. Based in Fort Worth, Texas, American Ceramic Supply Company services and supplies ceramic equipment and supplies to traditional ceramic shops, paint your own pottery studios, ceramic potters, art teachers and art educators, ceramic and pottery finished ware producers, ceramic and pottery home based hobbyists. American Ceramic Supply Company provides education, training and consulting services to traditional ceramic shops, paint your own pottery studios, potters, art teachers and art educators, ceramic and pottery finished ware producers and home based hobbyists. American Ceramic Supply also educates and assists the architects, contractors, builders and electricians for our customers as they create their ceramic shops, paint your own pottery studios, ceramic rooms in their new schools and buildings and in their homes.

American Ceramic Supply Company and American Glass Supply Company sell ceramic kilns including Paragon Kilns, Skutt Kilns, Amaco/Excel Kilns, and Olympic Kilns. Paragon’s Kilns include the Touch and Fire electric automatic kilns such as the TnF 82, TnF23, TnF24, TnF27 and TnF28’s, the Ovation kilns, Dragon and Super Dragon kilns, Iguana Kilns, Caldera and Clamshell Kilns, Janus kilns, as well as the small kilns such as the SC series kilns, heat treating kilns, doll and porcelain kilns. Skutt kilns include the Kiln Master kiln series - the popular KM818, KM1018, KM1027, KM1218, KM1227-3 and KM1231 kilns, the Glass Master kiln line such as the GM814, GM1014, GM1214 - the very popular GM1414 coffin kiln, and the production glass kiln line - the GM818, GM1018 and the GM1227-3 as well as the Skutt Hot Start Pro Kiln and the new Firebox kilns - Firebox 8 and Firebox 14 including the clamshell kiln GM22. Through American Ceramic Supply Company, Olympic Kilns has fantastic gas and glass kilns, raku kilns, electric - manual and automatic kilns such as the Dual Media Kilns, the Champ kiln, the Freedom Series kilns, the Commercial Electric kilns, and the Torchbearer Gas kilns- both available as propane or natural gas kilns. Amaco kilns and Excel Kilns are very popular kilns with teachers and art educators. Front loading kilns, top-loading kilns, professional kiln line series, Fine Art kilns, Professional Kiln series, and metal enameling kilns are all part of the Amaco kilns and Excel kilns production series. Whether you need a pottery kiln, jewelry kiln, silver art clay kiln, glass fusing kiln, glass slumping kiln, knife heat treating kiln, clay tile production kiln, low fire kiln, high fire kiln, 120V kiln, 240V kiln, 208V kiln or even a 480V kiln! - American Ceramic Supply Company can provide you with just the kiln for your very special needs and desires to last you for a very long time!

American Ceramic Supply Company continues to sell, service, educate and provide on-going marketing and technical support to the ceramic and pottery industry. Our goals are the best customer service we can possibly offer, generosity of information to our customers so that they can succeed and accomplish their ceramic dreams and desires and
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