Bitcoin Forum

What do u use? Currently, I am using polyester air filter at G4 efficiency. I think G4 is the equivalent of MERV 7.
Am I right to say that data centres use MERV 11 level of filter

MERV Filter Level
http://www.ksklimaservice.com/en/classification-of-filters-filter-properties-and-typical-examples-of-use

Filter Classifications and examples
http://www.ksklimaservice.com/en/classification-of-filters-filter-properties-and-typical-examples-of-use

What air filter level do u use and how often do u clean the dust off your antminer??  :)

I blow them out when I sell them

Huh, u mean u only clean when u sell them?
U dont do anythin else to stop dust before?

There is not much you can do if your room is not air tight.. You will just minimize it with those filters due to infiltrations of room openings. Most mining rooms are negative pressure due to exhaust system.

Reducing dust and crud build-up is an important goal if you're going to be mining for any length of time. When dust builds up in a miner it blocks the heat transfer of course, but also allows airborne grease and oil to become trapped in the miner making a real mess. This acts like a nice little blanket over your chips/fets, sealing in the warm-ness.

These usually show up at my repair facility with burned chips and FETs. Fixable, but a mess.

The real problem of course is when that combination of lint and oil catches fire from an overstressed capacitor shorting plus 4,000 watts of +12v from the monster supply feeding several miners. Then the lack of a Halon system in your mining center becomes an issue....

And then there are the people who run miners in horse barns.......

Mine has only 1 opening and i can put an air filter

So, do u use an air filter.
Noted your information.

 Sure there is.

 Filtered air INTAKE and positive pressure design.

 If you have POSITIVE pressure in the room infiltration isn't an issue.


 I suspect most mining rooms are negative pressure because folks ASSUME that a "gable" type fan can ONLY be used for exhaust (it's what they're designed for, but they CAN be used for intake with proper design and installation).


 I do the positive pressure filtered intake more due to MY issues with dust and smoke and such vs for the miners though, especially after last summers massive "smoke from many many forest fires upwind" issues in my area.

So, wat level of filtration do u use

You can use the spare current from a 20 amp circuit to run your blower or run it's own circuit. You can hit up craigslist for a household hvac blower and that will move enough air. You could probably use a few layers of air filters on the intake and exhaust to reduce the noise level but these will greatly reduce air flow so you will need a blower that is significantly more powerful than you might think.

You will be building a box shaped tunnel with a few layers of air filters on the front and back. You will need a divider to mount the blower; so you final shape will be more like two boxes with one open side on each and a hole for the blower in between. The open sides are where you will mount the air filters. I suggest something like these with two or more on the intake and exhaust.

Hope that is of help to clear out your air filter

 I want to say MIRV 12 - whatever the "orange framed" ones Walmart sells are.

My blower is strong enough af fhe moment and i can still increase its power.

If u use a merv 4 filter followed by a merv 11 filter, would that slow down the airflow alot?
The boxes help hold more dust?

U mean merv 12? Any pics?

Absolutely no filtration. I plan to blow it out with an air compressor every 6 to 12 months or as needed, which won't be often.

And that is good enough? How do u know u need to use the air can. When the temp is higher than normal?

The filters I use are MERV 9 - 3M brand.

If you use an air compressor to blow ANYTHING electronic out, make sure it has a VERY VERY GOOD water trap - water in electronics = BAD THINGS HAPPEN if they're not specifically designed for it like "water resistant" watches and underwater specific gear.

The air out of a compressor also has a bad habit of being pretty dirty if the water trap is a cheap one or there isn't one.

Shouldnt all filters trap water? Polyester filters shouldnt allow any.
Quint, u find merv 9 to be good enough?

MERV 9 filters out pollen and dust - it's enough.

 Most air compressors don't HAVE a filter, and it doesn't stop water from condensing as part of the compression cycle if they DO since the filter will normally be on the INTAKE to protect the compressor itself.
 Many but not all have a water trap on the output, but some of them only trap SOME of the condensed water (even the GOOD ones don't get it all, but they get enough to drop the RH of the output air enough to keep it from spewing water drops all over stuff).

I use merv3, Less restriction the better, I don't see any fine dust partials settling on the hash boards at such high fan speeds.

like this ;D

https://i.imgur.com/3Uxq7G0.jpg

 I go with the 9 to keep my OWN problems with breathing under control - especially this past summer of massive forest fires everywhere making Central Washington air far worse than Los Angeles ever gets.

 The miners would probably be plenty fine with those "fiberglass" type washable filters, or even no filtering at all.

Blowing it out every 6 to 12 months in my area would keep it clean enough to where i'd never see a noticeable temp increase from dust.
If temps were higher than normal, first thing i'd do is check for dust though.

Hmmmm I see. U checked it inside? Is this after a few months or how long?
The outside is still abit dusty right? But I guess that doesnt matter

This have never actually happened before right?

I see. So, the G9 is for u and not the miner lol




So, u use no filter and only do blowing every few months ya

One of the large Chinese bitcoin farms had a fire that burnt out most of their facility.
I suspect most fires involving miners have been small though - probably only burnt part of the board on one miner due to power overdraw at the connectors.

Curious on this. Wat lead to this?

Based on the pics in the thread, it looked like a combination of hot dry weather, VERY poor wire management, and probably something got overloaded - coupled with NO fire prevention/retardation measures used.

I agree, just a basic  filtration. MY filter is washable.  Not worried about dust or pollen. I just dont want any larger items to get caught up in heat sinks, like hair or lint. My dog sheds like crazy.

Perhaps I should specify more.

 The filters I use are on the air intake to the ROOM - which uses 3 standard box fans (20"x20" filters are a PERFECT fit for those) pulling out of an "airbox" I built that sucks the air through an intake vent that is about 16" x 30".

 With the triple fans setup, the real airflow restriction is the vent itself.

I see. Noted all the info. Thanks

Wow 3 box fans, thats total of 15,000 cfm?

 More like 6000 if they weren't air filtered - I figure I'm probably getting about half that WITH the filters in place, more when the filters are new less when they get close to end-of-life clogged up.

 Typical Lasko/Galaxy standard low cost box fan is rated a little over 2000 CFM, if I remember the spec sheet I found on them ONCE after a lot of digging.

I see. So less than 6,000 cfm. How many miners do u have?
Total watts around 6000?

Between the ASICs, the GPUs that are actively mining, and my BOINC/Moo Wrapper/Dnet farms (plus a few extra machines and the evaps etc) I'm pulling ballpark 15 KW on average.
 Bit less the last couple months after I shut one evap down and the other has been getting turned off part of the time by the thermostat it's on.

Correct