I have a box fan that is about 1 ft by 1ft by 6 inch it can produce 430 cfm but I can’t focus the airflow into a forge either having backflow or air blowing out the side of any entrance tunnel I try to dig into the foundry which is built into the ground. I’m wondering how I can attach and funnel the airflow into a pipe for more air pressure into my propane foundry. I don’t know if it is doable or if I should buy a fan that can achieve higher pressures. AC Infinity AXIAL 2060, Muffin...
This is the fan for reference