Hi everyone
Got myself a Haotian 60W Fiber Mopa Laser, and need to install extraction
Ive just bought from a local gro store a 5" inline fan and 2 x ducting reducers to 4" as i already have 4" ducting Krystal Dual Speed Inline Fan (growpro.co.uk)
I am now wondering before I start to install it, whether it was the correct buy?
Can anyone please tell me, will this fan be sufficient, or should I get something bigger?
Thanks
legepe
Depends on how much smoke you are planning to create. Everyone talks about how good their system sucks smoke, but nobody mentions it blowing the smoke against the prevailing winds outdoors.
I have a 3" fan and duct on my 10w laser. I have a 4" fan and duct on my 40/20w laser. Both seem to work pretty well. I did have to put shut-off cover plates on both. When using one, the smoke would go out the window and back in the other. 
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Thanks for reply with explanation, the company I bought the laser from are advising I get this fan, It just seems big to me??
Cloudline Pro S8, Quiet Inline Duct Fan System With Speed Controller,– LED GROW SHOP UK
I think a 800cfm fan would definitely do the job, but seems like overkill to me. I would go with what you have. If it is not enough, buy a second set and run a parallel duct. I expect that would stil lbe cheaper than that megablower, 8" ducting, and the fittings.
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I was looking at the SM enclosure earlier and that is 82.33 cubic ft.
They use a 95cfm fan.
That rating is for the 40w module.
I saw it cutting I think around 15mm test and there was quite a bit of smoke…not sure about the wood type.
I would be thinking about the intake of the module fan and temperature rise as well as cleaning cycles…and getting enough replacment air in to the enclosure, then I’d up the suction if need be.
Interesting stuff…this air flow and exhusting and Im kinda looking forward to working on some method’s.
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Sorry for late reply on this. I ended up getting https://www.amazon.co.uk/Variable-Automatic-Kitchen-Bathroom-Internet/dp/B07VQVG9K9?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A2RJQ710YZYZ22
It has a variable dial so you can easily control the air flow
The company I got the laser from advised to get Fiber / Galvo Laser Air Assist Kit **Version 2** – Light Source Engraving but Im unsure if this would really be any good, ie particularly if you are engraving 300mm x 300mm I cant see it really working with a galvo laser setup. Anyone any advice?
Not sure you can apply to a galvo, but I mounted 3 each 1" 12v fans on some scrap 3mm ply with a variable supply in the front of both lasers. I run them for a gentle breeze to move the smoke towards the suction. Seems to help in my case.
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Hi all
Sorry Mike, this is a general reply but I hit the reply to your post accidentally.
Im wondering if anyone has ever tried rectangular ducting.
I have a situation here where I found myself not wanting to drill a big hole through two layers of insulation and twelve inches of cavity wall…just because!
I was looking at using my v-lux attic windows as an alternative to drilling and while searching for fans and ducting I found a company in england that make rectangular ducting with flexable joints etc.
The problem with using attic windows with tube ducting is the air gaps are huge and we’re up the side of a hill so quite exposed the elements.
So if I lay a square length of duct 22" across the opening the window I can close down level with virtuality no gaps up the side. smoke can vent out either end of the duct or I can make holes along the outward face. I can T off that duct with a flex rectangle and run a length of duct down to the enclosure. This means I can use any of the six windows in the loft if I need to move the unit. The windows are at 4.5ft and the table at 3ft and enclosure aprox 420mm high.
I worked up a design over the last few days and have come up with an arch/tunnel design with exhaust to the right side with its own smoke gathering box, sloping up to the exhaust vent - duct pipe & very close to the window. The left side of arch/tunnel will have all ply with cut out for 10" variable speed, box fan.
Timber frame base, routed for gable end to slot into and base frame also routed for powder coated 1+mm steel arch/tunnel…with viewing window for 455nm & IR1064 combined screen (I got word from Germany today that it is possible with one screen…I can give part number if anyone is interested.
I was with a cabinet maker in the next town over, and he estimates half a days work…but I have to design and be there for the job, so its been busy here thinking about the known unknowns & the unknown unknowns!!
The Snapmaker ray and 20w also arrived today, but the IR1064 is M.I.A
Also putting in feedthrough which the ray enclosure does not have.
Did not show up as just reply to me so no worry.
Whatever works for you is the correct way to do it. I do recommend you use two 45 degrees for the corners instead of 90 degrees. Much more efficient (less back pressure) for the air flow.
Don’t forget about shielding the outdoor duct against rain.