Ventilation in Kilns

Ventilation in Kilns

Introduction: Proper ventilation is crucial in optimizing your kiln's functionality and creating a safe working environment. In this article, we explore the significance of kiln ventilation and provide practical tips to help you achieve better results.

Section 1: Why Ventilation Matters

Kiln Efficiency: Ventilation significantly impacts kiln efficiency. It facilitates the removal of harmful byproducts, such as carbon dioxide and volatile organic compounds, allowing your kiln to operate more effectively and safely. Maintaining a balanced airflow can enhance firing outcomes and reduce potential issues.

Firing Consistency: Appropriate ventilation promotes consistent firing results. You can achieve uniform firing across your ceramics by preventing temperature variations and uneven heat distribution. Consistency is key for obtaining desirable glaze finishes and preventing defects.

Vent-Sure Kiln Downdraft Vent System

Section 2: Tips for Effective Ventilation

  1. Adequate Airflow: Use proper venting systems to ensure a consistent flow of fresh air into the kiln and kiln room. This prevents the buildup of contaminants and supports optimal firing conditions. Use a kiln ventilation system specifically designed for your kiln whenever possible.
  2. Vent Placement: Downdraft vents effectively remove contaminants and promote uniformity in the kiln by counteracting the flow of heat upwards. Hood vents can be helpful for removing heat and fumes from the room but are not as good for promoting kiln uniformity.
  3. Ventilation Control: Maintain control over your kiln's ventilation system to achieve desired firing outcomes. Adjusting the speed and direction of airflow allows for fine-tuning the firing process. Keep a balance between intake and exhaust to optimize the combustion and release of byproducts.
  4. Ambiant Room Ventilation: 
  5. Monitoring and Maintenance: Regularly inspect and clean your ventilation system to ensure its optimal performance. Remove any obstructions that may hinder airflow and check for wear and tear. Additionally, monitor the kiln's temperature and gas emissions to promptly identify and address any ventilation-related issues.

Section 3: Safety Concerns and Room Ventilation

Operating a kiln in an enclosed space without adequate ventilation can lead to dangerous situations. Ventilation is essential for removing fumes generated during firing and preventing excessive heat accumulation, which can pose a fire hazard. Prioritizing proper ventilation is crucial for ensuring the kiln operator's well-being and the surrounding environment.

  1. Check the temperature of the flexible ductwork while the kiln is at its maximum temperature. Most flexible aluminum ductwork is rated for at least 350°F, so if it is hotter than the rating, you should plug up at least one hole using high-temperature cement or other high-temperature fiber products.
  2. Be careful if you are using wax resist, as the wax may condense on the inside of the aluminum ductwork, which could be dangerously flammable. You should check this periodically and clean the fan motor and inside of the ductwork to remove any residue, particularly wax resist.
Calculating Heat Ventilation Requirements

Room Ventilation Guidelines: Aim for room ventilation that provides adequate air exchange to maintain a safe working environment. A general guideline is to achieve ventilation at 100 times the cubic feet of the kiln per minute. For instance, an e23T-3 has approximately 7 cubic feet. Multiply that by 100 and get 700 cubic feet per minute. For More Details Using BTUs: How to calculate ventilation requirements for removing heat from a kiln room

Conclusion:

Investing in a high-quality ventilation system can enhance firing results, create a safe working environment, and extend the life of your kiln and components. 

More

Do You Need A Vent Control?
  1. A vent control system lets you set the vent to turn on or off during different stages of the firing process.
  2. This gives you more control over the firing and reduces the air vented from the kiln and the room.
  3. Most fumes are produced at specific times during the firing process.
  4. You can get a vent control for most L&L kilns here
Can You Vent Two Kilns With One Vent?
  1. One vent can handle up to 20 cubic feet of kiln capacity so you could vent two 10 cubic feet kilns (two e28T-3 kilns for instance) with one vent.
  2. You can purchase a Vent Doubler to do this.
Do You Need Holes In The Lid?
  1. L&L does not recommend adding air-intake holes to the lid of sectional kilns, but you can do so if you prefer.
  2. If your kiln is not sectional or fits together very well, you may want to consider drilling air intake holes in the lid.
  3. The number and size of these holes should never exceed the number and size of the air exhaust holes.

 

VENTILATION VIDEOS

From Jessica Putnam-Philips:

Yes, you can install a kiln vent. If I can do it you can do it! In this video, I walk you through all the steps to safely install the kiln vent.

  • Tools and Materials:
  • Kiln Vent Kit
  • Flat Head Screwdriver
  • Phillips Screwdriver
  • Electric Drill with 1/4" bit
  • Yard Stick
  • Pencil Work
  • Gloves
  • This video shows how to drill your kiln bottom for a Vent-Sure ventilation system in case you are installing on a new kiln or if your holes are not already predrilled. The number and sizes of holes can be determined by looking in the vent instructions.

    VENTILATION KNOWLEDGEBASE

    What is the recommended temperature to turn off the Vent-Sure kiln vent when firing glazes,

    Calculate how many CFM of air ventilation you need
  • Look up the number of BTUs/Hour that
  • This question gets asked a lot around the holidays. L&L's official line on cooling the kiln

    Question: We received this semester a DaVinci 2327-D and I'm hoping you can help us with some

    It is fine to go through a roof with the L&L Vent-Sure kiln fumes vent system.

  • The motor extends 7" off the wall. Motor dimensions are 8" x 7". Wall plate dimensions are 10" x

  • The molecules of air (which expand during the heating of the kiln) do not carry many BTUs.
  • You should vent a test kiln if your regular kiln is vented.
  • You want to recreate
  • Before you purchase oil, check to be sure that you do not have a motor with sealed bearings.<
  • We recommend that you have a carbon monoxide monitor installed in your kiln room to
  • The Vent-Sure downdraft kiln vent is pulling not only air but moisture and the products of
  • Problem: You have a room ventilation system that is external to your kiln, and you want to turn

    A customer asks if he can interlock his automatic kiln so that it will not fire unless his

    EXTENDING DUCT LENGTH ON THE VENT-SURE VENT

    The duct can be 60 feet in length and include up

  • With air moving through the garage, you will minimize the corrosive effects of clay/ glaze
  • Control
  • Our DynaTrol or Genesis control with Dynamic Zone Control is the state-of-the-art
  • First, all the peepholes must be plugged, the lid adjusted properly, and any other holes into
  • Getting glaze on the element can cause that to happen.
  • It can also happen
  • An electric kiln atmosphere rich in oxygen will make elements, kiln-sitters, and thermocouples

  • We have never subscribed to the idea that holes in the lid are a good idea for venting. Other
  • Corrosion on a kiln is perfectly normal... mostly because it is a kiln! Hot-to-cold-to-hot