this because the filters are not high efficiency filters, I need more cfm then what's required
Any thoughts on this fan?
My exhaust goes out the left side. I don't know where my incoming is? I haven't modified that in any way. This is the exhaust fan that I have hooked up to it. My cuts are coming out great right now with the compressor though. Do you think too much air causes a problem?
So if I understand, you have a inline fan(perhaps with carbon filter) pulling out air. So you have negative pressure.
That is one intake?
Could you not, buy an inline fan(another 6” inline off amazon) VIVOSUN 6 Inch 440 CFM Inline Duct Fan Vent Blower Ventilation Fan for Grow Tent ETL Certified https://www.amazon.com/dp/B077492C4C/ref=cm_sw_r_cp_api_i_y1V-CbJTXJQSZ
Get some 6” duct, put the fan in your room and pull in fresh air with?
I don’t know how you are getting fresh air, but if you aren’t pulling in fresh air to circulate this could be a major solution. Let me know
My original exhaust fan is sitting on a shelf somewhere. I installed this one and it's really silent. It pulls about 1/3 of what the original one does, but I feel it's enough. This fan is bolted on a wall about 6ft from my brother's bedroom and it's barely noticeable. Also, power consumption is waaaaay lower than the radial fan than came with my laser
the fan is the cheapest fan I could find that delivers the CFS I needed. It is a centrifugal in line fan made for grow tents.
You may want to try an in-line fan used in grow houses. for example
If you look at my post history quite a ways you can get a good look at the design. I went to Walmart and seen the filters rated 99.97% and thought Maby this can work. Grabbed 2 and stuck em together into a plastic bin that looked like it could fit them. Bought 2 of the bins with lids and thick paste flex seal.
So for a shopping list at Walmart you'll need;
Hepa filters rated minimum 99.97%. I got the biggest f2 size by 3m I wanted 2 because I wanted the extra space
2 Plastic totes with lids. I looked at what they had in stock and put the 2 filters together while in the box to see what bin would fit them best.
Flex seal paste. The whole design is held together by the filter being sandwiched and glued with flex seal so you want the strong stuff, you may want a tube with the precision nozzle. Rtv silicone can work for small touches.
Air duct tape / HVAC tape / foil tape. The stuff they use to seal airways, this is to seal the lid on the fan side
Blower/fan. I'm using a 400 cfm inline fan there's a formula for required cfms per area of filter and it says I only need like 180 however I learned that, that's for an actual laminar flow filter. These filters aren't high efficiency there's a lot of resistance so the big fan is required for adequate flow.
As for instructions: glue the filters together and make sire they both face the same direction, use a generous amount of paste. Keep in mind the smallest hole in your seal is big enough for contamination to flow through so I used alot.
Let it cure over night and measure the hole on the bottom of the bin. you need for the tightest fit you can without squishing the filter. If you look to the top right of mine you can see some fins are bent open a bit, I've never had an issue because of it but I don't see it being good.
Try to make the hole as center as possible and do the same for the other side and squeeze the filter between the bins. Flex seal the hell around all the edges with a copious amount. I went ham on the flex seal because again its the only thing holding this build together and the slightest rip or hole will let contamination in. Do this on both sides. I think it's optional but the crease between the two bin I seal aswell just incase.
Lastly, decide what side is the air box for the fan and what side is the work side. The air box will be sealed with the lid on. Measure and cut the hole you need for the blower and tape the lid with the foil tape, make sure its completely air tight. Any leaks will dampen the airflow through the filter.
Bonus: the construction of most bins make your work surface slanted and this was a big issue for me, I solved it with an adjustable kitchen rack. The kinda temporary shelf that's metal and you can set the length. I extended it as far as I could inside the box while keeping it as close to the filter as possible. Made holes for the feet to punch through so the rack is standing flat on the table while giving me a proper surface in front of the flow.
Not this will not make a "laminar flow" hood but more of a steral wind tunnel. I haven't had a single one of the plates I've poured show contamination yet which is close to 100 or so. Total investment for me was around $162