Things to Consider When Buying an Oven or Furnace



What temperature does your process require?


It is tempting when looking to price an oven or furnace to over estimate the temperature requirements. By doing this all you are really doing is adding cost. The best way to get an accurate price is to find out the exact temperature required.


An oven will run from ambient up to 650°C whereas a furnace will run from 500°C to 1300°C.


Once an oven reaches approx. 350°C the internal lining will need to be changed from aluminised steel to stainless steel, therefore you will see a significant price increase.


For example, the price difference between 100°C and 200°C would be negligible, whereas the price difference between 350°C and 450°C would be substantial.


Therefore, it’s always best to know what is required. However, if you don’t know, more often than not, depending on the process and materials, we will be able to point you in the right direction. So don’t be afraid to ask.





How big does the oven need to be?


At Caltherm we will ask you the required internal dimensions for the oven.

Working out the internal dimensions for your oven or furnace is fairly simple. As a general rule, if you don’t know what size the oven needs to be, take the largest product that is going to go into the oven and add 100mm on each dimension.


Or example, if you product is 500x500x500mm, you are going to need an oven 600x600x600mm.


Don’t forget to consider the loading technique for the product. Eg. additional room for trolleys etc.


If your oven needs to be calibrated with a temperature uniformity (eg. +/- 5) then this area would need to be expanded by approx. 400mm.


Therefore the Calibrated area would be 600x600x600mm, whereas the actual chamber dimensions would be 1000x1000x1000mm.


If you don’t know the size of the oven required but you do know the product size just send this to us and we will do the working out for you.





How quickly does the oven or furnace need to reach temperature and how long does it need to stay there.


If you have a set process time that you need to work to let us know and we will do our best to ensure that the we meet your requirements.



Temperature Uniformity


Some standards such as AMS2750E (used within the Aerospace industry) call for ovens and furnaces to be calibrated to function within a certain temperature range. For example 250°C +/- 3°C.


All of our ovens will have a certain element of uniformity (approx. +/-5°C to +/-10°C) as standard. All the above means is that the oven will be calibrated and certified to your chosen standard.


If you require temperature uniformity or you are working to a certain specification or standard just let us know. At Caltherm we are familiar with all the industry standards and have vast experience designing and manufacturing ovens to suit.





Where does the door need to be?


As standard a box oven will have a manually operated, single hinged door to the front. However there are plenty of options if this doesn’t suit the environment or the size of the oven. Please note that we recommend, where possible that double doors are avoided as single doors offer better temperature uniformity. (and offer a cost saving to the customer)


Double Hinged Doors – We can provide double doors where a single door would take up too much space when opened.


Vertical Hydraulic Doors – We can provide any oven with a hydraulically operated vertical door. Ideal in situations where space is tight and in larger applications.


Sliding Hydraulic Doors – We can provide any oven with a hydraulically operated sliding door. Ideal in situations where space is tight and in larger applications. Also available in double configuration.


Doors to Front and Back – Referred to as a “Tunnel Oven” we can offer manual or hydraulic doors to both sides of an oven, ideal for loading in one end and unloading out the other.


Top Loaded Ovens – Our top loaded ovens or “Well Ovens” have the choice of an open top, hydraulic pivot lid or sliding lid available in single or double versions.



Heating Media


Electric or gas-fired are the most common, however, we are experienced with thermal fluid, steam and indirect gas-fired.


The heating media required really depends on the facilities on site therefore the more we know at enquiry stage, the more accurately we can price an oven/furnace with the most economical heating media for you to run.





Do you have a budget in mind?


Although it can be tempting to keep your budget to yourself, it is best to let us know what parameters you are working within so that we can work to come up with a realistic offer that fulfils your requirements.

Once we know all your requirements we will work with you to offer you a product that suits your application AND your budget.

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