Very thoughtful comment. Thanks for weighing in. I’m getting ready to set this up in my new shop, so I’ll consider your suggestions here.

Hey! Thanks or the tip - I’ll think about the spring approach. Now that you mention it, I remember seeing that in one of your enclosure videos. I’m a long-time viewer of your channel by the way, keep up the great work!

Cool, Thanks for watching. Nice looking enclosure also. @@asherdiy

Very interesting ideas. One question. Wouldn’t it be better to have a larger exhaust (e.g. 6 inch) than intake (e.g. 4 inch), because then the exhaust would create negative air pressure INSIDE the box, meaning that it would pull in all the intake air as well as some ambient air in the room. That’s the way I was thinking about it, but do let me know if that’s flawed thinking.

I'm no engineers.. so, I'm guessing here. It would depend on the situations? For me, I have a 100W Thunder laser in a basement that is venting through the 1st floor and an attic. The laser generates a lot of smoke and smell. The basement air is cold and the smoke from the laser is NOT hot so I don't get the draw effect from the flue/chimney (20 ft in height). If anything.. in the summer I'm fighting to push the heavier cold air (68F on average) up to the roof. I originally had two 6" ducted fans. One is at the laser and one in the attic on the same flue. They were not enough. I still had some smoke and smell. So, I built a door with a 20” fan in it to blow air into the room from the rest of the basement. It worked .. no smoke or smell at all. The 20” fan was moving more air into the room than what the two 6” fans can pull out. So, for me it was inefficient to draw a vacuum with 6” ducted fans and at the same time try to push/lift the cold heavy air up 20 feet. For you a bigger out flow might be better since you are not fighting gravity. I think the most important thing is to have a differential in air pressure. The two fans should be of different capacity (CFM - Cubic Meter per Second). You can use the same 4" Dia. ducts for both. Just have one fan stronger than the other. BTW - I forgot to mention that I like your box! Very nice!

Hm - now you've really got me thinking! I hadn't thought of the role of heat in this equation (e.g. rising smoke in a chimney). I'm actually moving to a new workshop in about a month, so maybe I'll be able to play with optimizing the airflow a bit more at that time. Thanks for the really thoughtful thread here!

Good question - it’s been awhile, but I believe it was called JTech Photonics

Sure thing - I got them from Jtech Photonics. Ordered it online from their website.

@@asherdiy - Thank you!

Yeah - it took me a really long time to figure out how to edit down all the footage to a manageable length of time.

Build plans would be cool. 😎😁

JTech Photonics

Or just trick two friends by inviting them to a build “party” :)

@@asherdiy 😆

Thanks! For the fans, i use a 4inch (and slightly less powerful) fan for intake and a 6inch fan for exhaust. My original logic was that using a less powerful intake fan would still create some negative air pressure to account for any leaks in my seam sealing. With that said, I’m not sure it’s a perfect solution, so if you get good results with a different setup, I’d love to hear your approach.

Hi Andrea - sorry, I’ve been swamped with too many other things. So Unfortunately I probably won’t get to it soon.

Completely understand! I can figure out most of it from the video. Thanks for replying

If you’re talking MM, then unfortunately no. This design would be long enough, but not deep enough for your laser. BTW - I think I remember coming across this laser. Is it the one where you can basically extend it in two directions? Giving you a very large extended square working area? Just curious because most lasers only extend in one direction, whereas I think sculpfun allows “double extension”