I want to upgrade the stock inline blower for my omtech pronto 40, any suggestions?
Generally speaking… find out how large a vent in the back of this is and look for a ventilation system that works for you.
I’d suggest removing the stock fan. If you’re not a hydrologist or someone who can compute the air movement. When you have more than one fan, one usually put a drag on the other one. Smooth vent pipes work best for less drag. The more straight the airflow the more air will flow, less resistance.
Virtually no one can do all of these. I’d suggest a ventilation fan that can draw from the machine and place the fan outdoors, if possible, but the closest you can get to the outdoor vent. Mine are not outside, but it would be more desirable.
With a vacuum any leaks, between the fan and machine will suck in room air, so it makes sure most of it goes outside.
Most of us can’t do many of what I’ve suggested, but you can pick what you can and can’t do.
If you keep it simple with as straight as possible air flows, it’s going to work best.
I have the 50W equivalent but mine’s a 5030 size. I have to leave the top open about an inch to allow air flow across the table and material.
Lots of people have different setups, so hang around and I’m sure you’ll hear other opinions.
Good luck
Thank you! Now I know what the holes in the front of the machine are for😅 I was like man this seems like a stupid design but turns out I didn’t understand the purpose
Here’s mine, stock vent fan, stock air pump, lid completely open. It’s cutting 5mm sub flooring at about 11mm/s@45% if I recall.
This was a while back, while I was still learning how to drive it. 
Have questions, ask.