I have a Jet air filter, which I bought about three years ago. I give both filters a good vacuum every week, and it still seems to work OK. They look fine, nice and clean, but do they become less efficient over time? Should I replace them now and again? Or can I assume that if they still look in good condition and seem to do the job then everything is OK? Any thoughts?
Air filter replacement interval
- Thread starter marcus
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Marcus
I also have a Jet and have to admit that I don't clean the filters as often as I should. It doesn't get mush use in the summer because I have a good air flow through the WS, but in winter its frequently used.
Regarding the filter, like you I give them a good clean. Mine are about 5 years old and I've no evidence to suggest that its not working efficiently.
I also have a Jet and have to admit that I don't clean the filters as often as I should. It doesn't get mush use in the summer because I have a good air flow through the WS, but in winter its frequently used.
Regarding the filter, like you I give them a good clean. Mine are about 5 years old and I've no evidence to suggest that its not working efficiently.
RogerS
Established Member
Marcus...very hard to comment without knowing the model.
riclepp
Established Member
The filter would become damaged over a long period on time due to the air and debris being sucked through the filter medium, if it is the paper type the microscopic pores become enlarged and thus allow more of the stuff you have sucked in let back out into your breathable atmoshere. I would look at the OEMs from the manufacture booklet and go on that.
RogerS
Established Member
Looking at the cost of the replacement filters, how much is a new pair of lungs ? :?
Argus
Established Member
.
Paradoxically, filters become more efficient as they gather more debris; the downside is that they reduce the airflow at the same time - very often in large commercial ventilation applications they may be oversized to prolong life for this reason.
There are numerous technical standards on filter efficiency but, put simply, the efficiency and degeneration in use of a filter (and its degree of blockage) is generally gauged by measuring its pressure drop, either with a differential inclined manometer or you can make your own with a couple of short lengths of thin PVC tube bent in a 'U' and strapped to a scale and with a small amount of water.
One is positioned either side of the filter. Note the pressure drop on a clean filter then monitor during use. Unless you have manufacturers' recommendations, assume by rule-of-thumb that a 40% change in PD is the acceptable limit.
I should add that you will need an amount of duct either side for this to work; free standing filter assemblies are difficult to gauge other than by sight or a noticable drop in air-flow..
.
Paradoxically, filters become more efficient as they gather more debris; the downside is that they reduce the airflow at the same time - very often in large commercial ventilation applications they may be oversized to prolong life for this reason.
There are numerous technical standards on filter efficiency but, put simply, the efficiency and degeneration in use of a filter (and its degree of blockage) is generally gauged by measuring its pressure drop, either with a differential inclined manometer or you can make your own with a couple of short lengths of thin PVC tube bent in a 'U' and strapped to a scale and with a small amount of water.
One is positioned either side of the filter. Note the pressure drop on a clean filter then monitor during use. Unless you have manufacturers' recommendations, assume by rule-of-thumb that a 40% change in PD is the acceptable limit.
I should add that you will need an amount of duct either side for this to work; free standing filter assemblies are difficult to gauge other than by sight or a noticable drop in air-flow..
.
RogerS
Established Member
Spot on, Argus. In fact I investigated this myself with my Axi 2200 chip collector (as opposed to the air filtration type system of the OP). This was fitted with a fine filter from RB Industrial and I had suspected loss of suck...see this thread here.
post581411.html?hilit=2200#p581411
Subsequent to this, although I can't find the thread, I bought a cheap manometer and measured the pressure drop across the old fine filter. If the filter is flowing well then the pressure drop should be minimal. It was not. Out of curiosity I weighed the old filter and a brand new filter. Even though I'd whacked and tried to de-dust the filter, there was still over 4kg of dust inside it. And the filter only weighed about 5kg!
post581411.html?hilit=2200#p581411
Subsequent to this, although I can't find the thread, I bought a cheap manometer and measured the pressure drop across the old fine filter. If the filter is flowing well then the pressure drop should be minimal. It was not. Out of curiosity I weighed the old filter and a brand new filter. Even though I'd whacked and tried to de-dust the filter, there was still over 4kg of dust inside it. And the filter only weighed about 5kg!
RogerS
Established Member
Well done that man! That was the one
Thanks for all your comments. I think three years is enough, I've ordered another set!
Probably time I took this stuff a bit more seriously (not that I'm totally blasé about it, but its easy to get complacent). Turning 40 brings things home a bit. Apparently I'm no longer immortal :evil:
Probably time I took this stuff a bit more seriously (not that I'm totally blasé about it, but its easy to get complacent). Turning 40 brings things home a bit. Apparently I'm no longer immortal :evil:
Thanks for all your comments. I think three years is enough, I've ordered another set!
Probably time I took this stuff a bit more seriously - not that I'm totally blasé about it, but its easy to get complacent. Turning 40 brings things home a bit. Apparently I'm no longer immortal :evil:
Probably time I took this stuff a bit more seriously - not that I'm totally blasé about it, but its easy to get complacent. Turning 40 brings things home a bit. Apparently I'm no longer immortal :evil:
