Thread: Samsung Large room Air filter.

The school I work at part-time has 138 of those!

Originally Posted by jack620

The school I work at part-time has 138 of those!

Assuming they are also working on ventilation, it's good to see schools taking COVID-19 measures seriously!

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Originally Posted by BobL

FWIW I have a 99.99% @ 0.3 micron HEPA filter extractor Unit in my shed that runs at about double the air flow speed of the Samsung - I use it mainly to check and calibrate the zero setting on my particle detectors. I could have used this into the house but its about 3 x bigger in volume than the Samsung and its also noisier. It does mean I can host people safely in my shed but there's not much room to stand which limits that anyway

What unit do you run in your shed, Bob?

Originally Posted by hurcorh

Assuming they are also working on ventilation, it's good to see schools taking COVID-19 measures seriously!

Agreed - ventilation/filtration is vastly underrated for this sort of things. The school where my DIL teaches also uses the same air filters,

Originally Posted by hurcorh

What unit do you run in your shed, Bob?

It's a earlier model of this unit - still has almost identical specs.
Mine is 2 x 4ft.
Envirco MAC 10 LEDC Fan Filter Unit

I got the filter for mine after a fire in a lab at work in ~2008, and 14 of the HEPA filters (just the filters) in a lab were deemed unusable due to smoke damaged and all replaced by insurance.
A couple of the filters were dark grey/black while the others ranged from mid grey to bright white.
I kept 8 of the least smoke damaged, 99.99% @ 0.3 micron HEPA filters, 600 x 1200 x 150mm, and took them home.
I tried to give them away on the forums and one member took two, I kept the rest for a few years and ended up keeping 3 of them and the rest got binned. Still have 2 in my attic.

My Envirco fan unit also came from work where it was a originally sent to act as a template to the fibreglass manufactures who made our lab modules. It sat at the manufacturers factory for about 5 years and got slightly corroded and contaminated with all sorts of gunk. Eventually they delivered it back to us and the boss said chuck it out, but I grabbed it and cleaned it up - came up real nice. We were running over 70 of these fan units in our labs and some of the filters were rated at 99.997% @ 0.3 microns. I remember when they arrived in a sea container. long with the fan units came about 90 filters and they all came from the US but we bought them through a business in NZ - weird arrangement but it gave us the lowest price.

There were up to 3 layers of these HEPA filters involved in some labs. Maintenance tradies could come into these labs just wearing booties over their boots (and shedding dust particles like there was no tomorrow) and after they'd left it would take about 15 minutes for the dust counts to get more or less back to before they came in.

Hepa1.jpg
HepaSpecs.jpg

After running the filter on the slowest speed for two hours the particle counts of the exit air got to zero 0.3µ particles /m^3. The room air is still 5 ug/m^3 but the back door has been open and the there has been "dust making activity" ie dogs running in and out ,and no recirculation (ceiling) fans running. I turned it off as cooking of teh evening meal has commenced and its not advised to be run while cooking if it can be avoided.

Have run this thing a few times and have noticed one thing.

The lowest reading of the room air on the Samsung display is 5 µg/m^3 , even when my particle meters say ZERO µg/m^3 and even when they say ZERO particles/m^3

If I run the thing for about 30 minutes and then I carefully move my particle meters around the room (so's not to raise dust off surface) the readings are between 0 and 1 µg/m^3, number of particles/m^3 appear to reach zero even on the other side of the room.

This suggests it working better that the reading provided by the Samsung's internal meter.

We have been using one of these for the past five or six years.

Dyson Purifier Hot+Cool™ | Dyson Australia

Filters out dust to 1 micron, removes odors, bacteria, pollen etc and heats the room in winter. It has a sensor that turns it on when the air is not pure enough.

Not sure what filters normally cost but I bought half a dozen at a clearance for $10 each and have only used two of them so far.

It has been a big help with maintaining health.

Apparently there are whole of house units available as well, one of my work colleague spent a considerable sum installing on at her place.

I know its early days, but do you find this works well enough to go around corners etc? or would one need one in almost every room?

Originally Posted by tonzeyd

Apparently there are whole of house units available as well, one of my work colleague spent a considerable sum installing on at her place.

I know its early days, but do you find this works well enough to go around corners etc? or would one need one in almost every room?

Im still testing Tony but I seriously dont believet it will work through a single open doorway. We have a semi open plan kitchen/dining/family that is about 60m^2 which I'm hoping it will cover. We have two ceiling fans that can help circular the air which should help. We would don't expect short visit guests to do anywhere else except perhaps the bath room which has an exhaust fan.

If one of us gets the COVID we can do an upstairs/downstairs isolation and we'd move the air filter into the room with the COVID suffered to prevent it spreading to the rest of the house.

Originally Posted by doug3030

We have been using one of these for the past five or six years.

Dyson Purifier Hot+Cool™ | Dyson Australia

Filters out dust to 1 micron, removes odors, bacteria, pollen etc and heats the room in winter. It has a sensor that turns it on when the air is not pure enough.

It's 0.1 microns.The Dyson is nice unit but I find it hard to believe the flow rate specs. The fan and the filter are small and If it really moved that much air the small filter would clog up pretty quickly.

Originally Posted by BobL

It's 0.1 microns.The Dyson is nice unit but I find it hard to believe the flow rate specs. The fan and the filter are small and If it really moved that much air the small filter would clog up pretty quickly.

Never had a problem with it clogging up, but I do take the filter out and clean it with the compressor occasionally, like once or twice a year.

Originally Posted by BobL

If one of us gets the COVID we can do an upstairs/downstairs isolation and we'd move the air filter into the room with the COVID suffered to prevent it spreading to the rest of the house.

We did almost that with the Dyson unit here. Jools had COVID, I didn't catch it. The house is a bit small to allow any real isolation but something worked for us.

Using a compressor On a HEPA filter has a good chance of blowing pin prick holes in it - I’ve done this a few times at work. Without a proper particle counter it’s not possible to see these leaks.. It might just be a tiny hole but it could compromise the efficiency. It might not matter for allergy issues but these things are already working near their limit for viruses.