Placeholder Jen-Ken Kiln Vertical Air Bath 30 Heat Treat Oven — The Bevel
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Jen-Ken Kiln Vertical Air Bath 30


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Jen-Ken Kiln Vertical Air Bath 30

Current lead time is estimated at 2 months.

Are you working with longer projects and trying to figure out how the heck you're going to heat treat? Even heating on a blade 22" long with a 6" tang in a forge? Forget about it. How about trying to cover the blade in salt to guess the right temperature? Talk about salty. Jen Ken has your long blade projects covered with their Vertical Air Bath 30. This monster will likely require you to stand on a platform to quench but you'll be doing it confident that the heat treat is right on that project you just spent hours and hours and hours and ... well you get the point. Offering vertical blade suspension and all the same features as its younger cousin, the Vertical Air Bath 30 is an indispensable fixture for any sword maker. Stop struggling today and reward yourself and your art with the Jen Ken Vertical Air bath 30! 

Here's how other kilns work... Blades are inserted into a standard front-loading horizontal knife oven for normalization, hardening, or tempering. As oven temperatures increase, blades can bend and warp as a result of the stress of leaning on their sides. Another cause of blade warping in traditional front-loading kilns is uneven heat distribution. A standard front-loader heats from the sides and the back, creating more heat at the back of the kiln. This causes the front door area to get cooler and cooler. The uneven heating causes the tip and body of the blade to be much hotter than the tang, resulting in more internal stress and warp potential, not to mention that the blades in the middle of kiln get the least heat from the coils. When the front door is opened, and the red-hot blade is removed from its horizontal position, it is carefully transferred to the vertical position on the way to be quenched. During this transition further bending can occur, causing the bladesmith to spend valuable time reversing the warp and straightening blade after blade. The traditional long kiln design requires for deep tables or stands, taking up a ton of room in your workshop. With limited bench space, you may be forced to reach around a screaming hot kiln to reach tools, creating a potentially dangerous workspace.


Here's why theirs works so well... They've addressed the issue of uneven heating by designing the exciting new Vertical Air Bath furnace series. Our Vertical Air Bath furnaces deliver the best heat-treat possible because your blades are suspended vertically inside the chamber, allowing the blade to heat from all sides (360° heat), delivering completely uniform heat soaking at the desired temperature. The Vertical Air Bath is a refractory brick furnace with a specially designed baffle inside. Heat is absorbed into the brick of the kiln/furnace and is contained below the baffle when the lid opens. A unique cool touch handle extends out from the side and is reversable to either side of the kiln. When standing to the side of the kiln, the lid can be lifted without a blast of heat hitting the user. The blade can then be removed with tongs, and the lid is lowered. This quick motion allows for minimal heat loss and ease of use. The Vertical Air Bath chamber is heated from below the baffle and has another set of coils in the top section for quicker recovery as each piece is removed. The included power-interrupt lid switch de-energizes the oven, as you reach in to remove a blade. The Vertical Air Bath then begins heating again when the lid is closed. The kiln is designed to regain the full holding temperature, upon the users return from the quench. Blades never touch the kiln or each other, reducing the chance of heat sinks, cold spots, and warping. Spines remain straight because your knives are removed vertically, and then lowered vertically into the oil quench. This vertical suspension from the beginning of the process to the end allows for uniform absorption of heat and unimpeded movement while releasing internal stress. 


Large capacity... The Vertical Air Bath chamber holds up to 12 blades of varying shapes comfortably. Blades can be suspended several ways. We recommend a pin through the tang, a spring clasped to the tang, or you can simply turn the tang sideways between the movable ceramic rods, if the tang shape permits. Foil wrapped blades can be suspended by passing the support pin through the foil sheet or via the spring clasp method. This allows the vertical suspension format to be used with every technique. The process has zero interference, leaving your blades stress free and straight. 


Here's why you'll love it... The Vertical Air Bath is a smarter, safer, and more portable design, made to optimize your efforts, and make your workshop safer. The furnace comes with a rolling stand which allows you to move the Air Bath out of the way when it's not in use. Think of the bench space you'll save! You'll save time and effort due to the reduction of warps and waves in your knives. The power-interrupt lid switch prevents your blades from touching live elements, keeping you safer in the workshop. The Vertical Air Bath comes equipped with a standard 3-button controller that can loaded with the most popular normalizing, tempering, and heat treatment schedules. You can choose to upgrade to a 12-button controller for ease of programming, or choose the popular TAP smart touch screen controller. All of our kilns, ovens, and furnaces come equipped with standard mechanical relays, which you can choose to upgraded to solid state technology. 

Kiln Model:   Vertical Air Bath 30 
Dimensions Inside: The lower chamber is 22" deep and the upper is 7"  to the bottom of the divider.  The overall inside is 11" x 30".  
The outside of the kiln chamber is 16" x 34".
Voltage: 240 volts
Amperage: 26 amps
Watts: 6240 watts
Receptacle: 6-30R,  240 volt, 30 amp breaker 
Weight:  Kiln 110 pounds and shipping 150 pounds  (motor freight)  

Price Includes: Kiln, Kiln Switch,  stand with casters, a Set of 6 ceramic rods and pins and springs and user manual.

Shipping is FREE on all orders to customers within the USA. We are happy to assist any overseas customers as well but cannot pay for the shipping over the pond. 

We don't want to mess around with fine print and extra charges, we
like things to be simple and easy. We aren't your telephone company.

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at The Bevel.

  • Free Shipping in the USA. No hidden or extra charges. EVER.
  • Price match guarantee. If you find it at a better price, we will match or beat it!
  • 30 Day Easy Returns. Not what you wanted? Ship it back!
  • Customer Focus. We pride ourselves on great service and its easy because You are the focus.
  • Quality Matters. All our products are handpicked for quality. We know you'll love them but if there is ever anything wrong we'll fix it.

Oh and because we're awesome and think you are too! Let us help you make something awesome to compliment your awesome self!

Easy Returns

While we fully stand by every product that we sell, we understand that

sometimes you might change your mind or realize the product you

ordered wasn't exactly what you were hoping for.

That's why we offer a 30 Day Return Policy.

If you decide you want to return an item for any reason within 30 days
after receipt of your order, please email us at with your
order number and we will provide detailed instructions on how to
process the return.
Please note, you as the customer will be responsible for paying the
return shipping costs of the item(s) in your order.
Once your return item(s) have been received and inspected at our
warehouse(s), we will send you an email notification that we have
processed your return payment.

*Please note: In order to receive a refund for the item(s) ordered, the
item(s) must arrive back to our distribution center in "Like New" condition
and must contain all original packaging and accessories.
"Like New" means that the items you ordered must not show any visual
signs of wear.
If items are returned with visual signs of wear, or have any issues due to
use will not be accepted and no refund will be given.
If you decide you want to return your order, please email us at with your order number and we will assist you. We want to
make this as simple of a process as possible for you.

If the product is damaged, you must make note of it immediately when
signing for delivery and send photos to the day of
The Bevel will pay for shipping defective, damaged, or
incorrect merchandise at our cost.
Remember to keep all the original packaging for any items that need to
be returned. All returns need to be authorized by our customer service
department prior to being processed. 

We will ensure you get the product you ordered, undamaged, as soon
as possible. Items that become damaged after use are non-refundable
unless specified under warranty.

If you would like to cancel an order, please email or call our customer
service team immediately to avoid return shipping fees.
Cancellations received before shipment will receive a full refund.
Orders canceled after items have shipped will follow our 30 Day Return
policy and will be subject to return shipping costs.
Other Return Policy Notes:
If a certain vendor or product does not support the return policy stated
above, this will be noted in the product descriptions or in the product-
specific return information.
Products that are specified as certified pre-owned or used are ineligible
for a return
The Bevel only sells to purchasers who intend to use the
item(s) for the duration of its economic life. Orders purchased for the
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return under any circumstances. This includes but is not limited to;
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Customer Reviews

Based on 1 review

I bought one of these guys after talking with a fellow blade smith and man it makes it heat treating easy. I'm able to load in a whole batch of hunters in one go but it does get a little tricky if your using one quench! Definitely a great kiln for blade smithing.