IAP Air Products
Email IAP Air Products

Frequently Asked Questions - Ductulator

April 4, 2022

How to calculate duct work sizes for welding fume extraction layouts and fan CFM requirements

IAP Ductulator

1) Use the back of the Ductulator

IAP Ductulator sketch


2) Have a simple sketch of your system


3) Start with the first fume arm in line (3”). Then work your way to the last arm. Start with 3” duct work since you have a 3” arm.



IAP Ductulator


4) 3” dia is equivalent to 7 sq in  (see Ductulator red circled area)


5) Next arm is 3”, which is also 7 sq in 

IAP Ductulator in use


6) When you add 7 (first 3” arm) + 7 (second 3” arm) = 14 sq in.  Find 14 sq in on the chart.  It is equivalent to 4” diameter duct work.  So when you add the second 3” fume arm your duct work needs to increase to 4” diameter.

Ductulator picture 5


7) Next is a 6” fume arm.  This is equivalent to 28 sq in

Ductulator picture 6


8) 28 sq in + 14 sq in = 42 sq in


9) 42 sq in is 7.5" diameter duct work.  We would round up to 8"





Note: You can use odd duct diameters at 3", 5", 7", and maybe 9". Typical to stay to even afterwards, unless customer wants odd.


10)     At the fan inlet the duct work is 8” 


11)     The arm cfm is:


a.      3” – 170 cfm (1.5 wg)

b.      6” – 600 cfm (1.5 wg)

c.      Total = 170+170+600 = 940 cfm


The fan would need to be more than 940 cfm

If you don’t have a Ductulator and would like one, email Josh Cannon (Sales@iap-airproducts.com). He can help with all your welding fume extraction needs!   

SHARE THIS POST

IAP Stainless Steel Fume Extraction Arms
March 13, 2025
In industries like pharmaceuticals, food production, and beyond, ensuring a clean and safe working environment is crucial. This article explains how IAP Stainless steel fume extraction arms offer an optimal solution for managing fumes, dust, and airborne particles in various environments. These durable, easy-to-use systems are essential in maintaining air quality and meeting stringent safety standards.
 IAP Air Products Fume Arm Filtration Unit
February 7, 2025
The IAP Air Products Fume Arm Filtration Unit offers an essential solution for improving air quality and ensuring a safer work environment. With its durable construction, space-saving design, and ability to effectively capture harmful contaminants, this filtration unit is ideal for businesses seeking a reliable and cost-effective way to protect their employees’ health. Beyond its advanced features, the Fume Arm Filtration Unit promotes increased productivity, comfort, and compliance with safety standards. Whether you operate in a school weld shop, workshop, or industrial facility, the IAP Fume Extraction Arm Filtration Unit provides an efficient and affordable way to maintain clean, safe air in your workspace.
Preparing the Next Generation of Welders with IAP Weld Booths
January 21, 2025
The art of welding is an essential skill in industries ranging from construction to automotive manufacturing, and its demand continues to grow as the need for skilled tradespeople increases. To meet this demand, schools and training facilities play a critical role in preparing the next generation of welders. A vital component in fostering this development is the proper use of welding booths, which create safe, effective, and professional learning environments.
Share by: