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OT Air purifiers, how do they tell when to change the filter?

J

John Doe

Jan 1, 1970
0
In my case, I'm talking about a $100 air filter/purifier. The
light turns yellow, then red, depending on how clogged the air
filter is. Are they using motor current to determine that?

I would like to use my own custom filters. If they used motor
current, that will let me determine whether my filters allow
enough airflow.

Thanks
 
C

Cydrome Leader

Jan 1, 1970
0
John Doe said:
In my case, I'm talking about a $100 air filter/purifier. The
light turns yellow, then red, depending on how clogged the air
filter is. Are they using motor current to determine that?

I suspect it simply be a really long timer. I have a whirlpool AP450 I've
been tempted to open to examine. It has a light that goes on when it's
time to replace the $80 HEPA filter.
 
D

Dennis

Jan 1, 1970
0
In my case, I'm talking about a $100 air filter/purifier. The
light turns yellow, then red, depending on how clogged the air
filter is. Are they using motor current to determine that?

I would like to use my own custom filters. If they used motor
current, that will let me determine whether my filters allow
enough airflow.

Thanks
Commercial air handling system use differential pressure sensors or flow
measurement. Most home/consumer products use a timer. In fact on my home
thermostat you can set the timer reminder interval depending on the
filter type.
 
G

gregz

Jan 1, 1970
0
John Doe said:
In my case, I'm talking about a $100 air filter/purifier. The
light turns yellow, then red, depending on how clogged the air
filter is. Are they using motor current to determine that?

I would like to use my own custom filters. If they used motor
current, that will let me determine whether my filters allow
enough airflow.

Thanks

I got a bunch of used Holmes air cleaners I got on eBay. I wanted these
because it's easy to configure your own. I buy charcoal media cheap in
bulk. I use various polyester electrostatic media. It's got a thumwheel
knob on top, which looks strictly manual for month. I guess your supposed
to keep track. HEPA filters are high restriction when clean. Some more
costly multi filter cleaners change speed monitoring room pollution, so I
suppose some measure differential pressure to change filters.

Mine HP2400

Greg
 
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