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Offlinemushpunx
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How often do you change out flow hood prefilter/maitinence?
    #21465115 - 03/27/15 11:32 AM (9 years, 1 month ago)

Hey all!

I built my hood (in my sig) in early november. I used a furnace filter for pre filter, cant remember what it was but it was good quality.

Its looking a bit dirty

I guess its time for a change, figure Id ask how often you guys change yours out while Im at it see if I should go sooner or longer. I say it runs maybe 8 hours a week maybe 16 some weeks. The filters get changed every 3 months in a furnace, but that runs wayyyy longer and much harder.. filter looks black when you change it!

Also curious if there is other periodic maitinence I should be doing.

Thx folks!

-mushpunx


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Offlinemigraineur
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Re: How often do you change out flow hood prefilter/maitinence? [Re: mushpunx]
    #21465197 - 03/27/15 11:59 AM (9 years, 1 month ago)

I asked this question before. This was the answer from RR:

"You change it when it gets dirty and flow is restricted.  It has nothing to do with how many days or months, etc., it's based on hours of operation and ambient particulate loads.

You'll notice a flow reduction when it's time to change the prefilter.
RR"

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Invisibleblindingleaf
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Re: How often do you change out flow hood prefilter/maitinence? [Re: migraineur]
    #21465412 - 03/27/15 12:38 PM (9 years, 1 month ago)

i don't know how often i change mine.  i have them right up against blower inlet, so that part (a circle) gets dirty first, and the outside of it not against the blower stays white, so i kinda just compare the two shades of color and decide if i need to change it.  i use two, one really good one (forget the rating, but when u go to HD, they are rated by numbers), and then a crappier one in front of that.  the outer one needs to be changed more in my case.
im not aware of any routine maintenance.  i keep the face of the HEPA covered in btw uses with piece of cardboard.
i spray face of filter with aerosol lysol before turning on (archive RR suggestion)


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OfflineDeadPhan
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Re: How often do you change out flow hood prefilter/maitinence? [Re: blindingleaf]
    #21465510 - 03/27/15 12:57 PM (9 years, 1 month ago)

Really.  Aerosol?  Is the filter not paper?  How far away do you spray?  Ive thought of this but never sure it was a good idea


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Invisiblegrainbrain
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Re: How often do you change out flow hood prefilter/maitinence? [Re: blindingleaf]
    #21465516 - 03/27/15 12:58 PM (9 years, 1 month ago)

:whathesaid:  I only use one prefilter (Filtrete w/purple label), but otherwise agree 100% with blindingleaf.

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Invisibleblindingleaf
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Re: How often do you change out flow hood prefilter/maitinence? [Re: grainbrain]
    #21465527 - 03/27/15 01:02 PM (9 years, 1 month ago)

i use the minippleat filters, so it not aluminum faced like standard HEPA's, but still, the aerosol dissipates quickly


to clarify, i do not spray the pre filter, just the HEPA filter face before turning on.


--------------------
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MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts

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Offlinemushpunx
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Re: How often do you change out flow hood prefilter/maitinence? [Re: blindingleaf]
    #21465928 - 03/27/15 03:06 PM (9 years, 1 month ago)

Mines alluminum but I spray mine with lysol too. Right into the face then I let it sit for a minute before I turn it on


Ugh I have to reach under the table to plug in my hood cause I didnt add a switch, and every once in a while when I kick it on I get good lungfull of lysol if I forget to hold my breath :lol:


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Offlinemigraineur
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Re: How often do you change out flow hood prefilter/maitinence? [Re: mushpunx]
    #21469183 - 03/28/15 06:24 AM (9 years, 1 month ago)

I've never sprayed mine with anything like lysol. I wrap my unit in plastic wrap when it's sitting around not being used so it doesn't suffer from a built up of dust.

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Offlinemrsa
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Re: How often do you change out flow hood prefilter/maitinence? [Re: migraineur]
    #24510903 - 07/27/17 12:45 AM (6 years, 9 months ago)

I cut plexy to put on top of the pre filter and in front of the actual HEPA filter that I keep in place when ever its not in use. It's easy to clean and see through so you can notice any build up of dust. Plexy is pretty nasty to cut though, I do it on a table saw but you can cut it with any wood blade on any tool. Just wear a mask and do it outside if you can, you dont want to breath in plastic (plexy). Im a multi material fabricator (mostly wood though) and dont know that much about filters but it seems to work for me. It makes it easier than having to wrap your hood in plastic for sure. I built my flow hood 4 years ago and have never changed the filters (but Ive also not used it as much as many people on here im sure)

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Offlinemrsa
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Re: How often do you change out flow hood prefilter/maitinence? [Re: mrsa]
    #24510910 - 07/27/17 12:49 AM (6 years, 9 months ago)

also to add to that I use a dimmer switch on my squirrel cage blower so I probably wouldnt notice flow reduction as if I had a blower wired for a certain speed.

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Offlinemushpunx
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Re: How often do you change out flow hood prefilter/maitinence? [Re: mrsa]
    #24511006 - 07/27/17 03:27 AM (6 years, 9 months ago)

This is an old thread, I made it over 2 years ago. Since then I've changed my prefilter out about twice a year on average.
I've been lazy, definetly need to change it out again as its flow is getting weak again


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