I'm using it indoor with my P2 and it really helps reduce smoke and fume, if only the pre filter can clean by water and last longer, that would be perfect

5 stars since this thing SUCKS lol it works great...you are going to smell a small amount of burning but its very very little...the price though wow wish it was cheaper...if your using you S1 inside its a must...my laser isn't vented outside either and its great...buy once cry once lol

This significantly has reduced the smell when using the laser. It has also helped reduce the smoke. I think it was a great purchase and I feel safer when engraving because I am not inhaling the fumes.

I like how well it cleans the air while using the laser. Noise is at a minimum.

Dofes an excellent job removing the smoke and smell in my shop.