Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@y..., SKID Photography <skid@b...> 
wrote:
> We just found out, that due to our proximity to the WTC (World Trade 
Center) we
> are eligible for reimbursement (up to $500) towards the purchase of 
an air
> cleaning/purification unit.

My sympathies wrt you folks in NYC...  

> So....Any advice as to what t look for in this type of equipment?  
In the past,
> I remember reading some advice against using ionic (?) cleaners 
because of ozone
> issues.

I think I was the major yapper on that one. Actually, it turns out my 
wife just doesn't like the smell of the ozone produced, so I had to go 
HEPA...<g>

   And I assume that we would want a purifier/cleaner that 
takes out
> particulates from the air (as in a hepa filter?).
> 
> Also, are these things rated by room volume?


Honeywell is one of the biggest players in this. Out here in the 
middle of the great nowhere, Target is the place to get these things, 
carrying a decent line.

They rate these room units in "ACH"...Air changes per hour. For any 
given unit, take mine which is rated 6 ACH for a 16x20, the ACH will 
be different for your room size and so will effeciency. So ACH 6 
represents a 70% reduction in containimants, 8+ is 85% reduction etc. 
If I put my unit in 12 x 16 room instead of a 16 x 20 room, the ACH 
goes up from 6 to 10. So, confusingly, when you see an ACH number, you 
have to know for what room size they're quoting the number at. (Hint: 
with Honeywell, just look at chart on the box).

Most of the units are about $200 or under. You could get quite the 
filter system, maybe built into the h/AC(?) for $500. Or two or three 
of these HEPA units. Even ACH 6 is though to be "excellent" according 
to Honeywell.

You change the charcoal prefilter within 3 months, about $12 these 
days, I think. Then the $100 HEPA filter gets swapped out every 3-5 
years.
Jim H.
> 
> 
> TIA,
> Harvey Ferdschneider
> partner, SKID Photography, NYC