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Can anyone suggest a proper filter I can use to put in a window that I am sucking in about 3500 CFPM? I tried a couple off the shelf ones from the local hardware store and they seem to cut down on air flow a ton. I understand that a filter will cut air flow, I'm just wondering if you guys found a good balance of filtering and air flow.

I use gardening foil :)
It's made to let air, but not water. The trick is to buy the cheapest and not to be afraid to get advice in the local hobby market.

https://thumb.ibb.co/i7a4Nc/20171115_212558.jpg (https://ibb.co/i7a4Nc)

thanks, I will give that a try.

You're welcome. Let me know if you find a better solution, but I've been planning so long for a more professional solution ... This just works.

i use standard air filters and increased flow to 6000 cfm

thinking of ordering one of these for my garage build

https://store.buildclean.com/hepa-360-air-scrubber-p2.aspx

dust seems to come in from the door and the garage entrance as well as my rooftop exhuast fans

You can buy rolls of filter material at different MERV levels.  I use MERV 4 or lower.

These here work nice for window air filters.  They look nice. For your cfm requirements buy a few of these and tape them together

https://www.achooallergy.com/safeguard-window-filters/

I read somewhere that women's stockings would do fine as well. Just go to the ladies section and ask them whats best for you. Lol.

On the other hand, i've also tried ordering some air filters for cars. Will get back to this post once the automotive filters arrive.

Tradeoff on the "low MERV" stuff is it doesn't filter much - but if all you want is dust removal the MERV 4 level stuff is enough, and has fairly low air restriction.
If you just want to keep water out, there are "fiberglass" type washable "filters" that have VERY low restriction but don't actually filter anything at the particulate level.

ANY filter is going to kill airflow, unless you use fans designed for "high restriction" or "high backpressure" usage, and even THOSE will lose some airflow.

Near as I can figure, a standard Lasko 20" box fan (officially rated around 2400 CFM but I can't remember where I finally found that figure) MIGHT manage 300 CFM pulling through a 3M "Filterete 800" level filter (This equates out to about MERV 9 I think?).

Auto air filters are VERY high restriction - they are designed to work with an engine that generates a LOT of vaacum at the air intake.

Setting filters will not help you to avoid dust. During the operation of the cooling fans, the blades friction against the air. This leads to the magnetization. All the dust from the premises will be there. Remember the screens of old TVs? They were always in the dust. I recommend you not to restrict air flow into the room. Use a vacuum cleaner more often.

One thing you can do to increase air flow is to use more area for the filters than is used by the fan. To continue with QuintLeo's cheap-n-cheerful 20" box fan example, instead of using a single 20" x 20" filter, "vee" 2 of them together and then close off the triangular openings this creates on the top and bottom. Now you've got twice the filter area in the same square area (but obviously taking up a lot more volume).

Positive pressure of FILTERED air in the room will reduce dust levels quite a bit.
It's not a 100% cure, but it's a LOT better than nothing.

It's also nice if you live in an area that gets smoke at times (last summer in Central Washington was BAD) to be able to BREATH.


The "increase filter area" idea is a sensible one - it's one of the reasons most large commercial installations use 4" filers, they have that "V" built into them.
Better yet, make it a 4 or 5 sided "box" of filters on the intake (4 if the fan is against the floor, a wall, or the ceiling, 5 otherwise).

MERV6 Polyester Media - 1" x 25" x 10' (https://www.amazon.com/Filter-Media-White-MERV6-Polyester/dp/B017WOXA4Y)

MERV8 Polyester Media with a Heavy Dry Tackifier - 1" x 25" x 10' (https://www.amazon.com/Filter-Media-Orange-Polyester-Tackifier/dp/B017WOX62A/ref=pd_bxgy_328_2?_encoding=UTF8&pd_rd_i=B017WOX62A&pd_rd_r=YHA570J1BTY82DPXS95T&pd_rd_w=GpMGo&pd_rd_wg=x2vxc&psc=1&refRID=YHA570J1BTY82DPXS95T)


Exactly ...

If you have a small opening to suck in fresh air , build a box frame around that opening , and "cover" the box sides with air filter, this way you have 5 times more area than you just covering the opening with air filter .
Any air filter is a help for your mining rigs ... If you are living in a area where a pollen count is high , you should use filtered air for your mining rig...