ALLER AIR ANALYSIS
I have received the unit that was purchased from the open market and was very disappointed in it. I wonder how this unit can be developed, for our market; again this should not be our competition!
The comparison is listed below:
|
Aller
Air
|
Care
2000
|
|
| Total unit weight in pounds |
44
|
50
|
| Unit size in inches |
20.5
x 15.25 dia
|
29
x 14 x 15
|
| HEPA filter square foot |
28
|
80
|
| Filter monitoring |
none
|
pressure
guage
|
| UVGI monitoring |
none
|
LED
light
|
| Carbon weight in pounds |
13
|
15
|
| Noise level in decibels |
95
high
|
55
high
|
|
58
low
|
43
low
|
|
| UVGI lamp wattage |
1
@ 10 w
|
2
@ 9 w
|
| Lamp germicidal irradiation |
30
m w-s/cm2
|
64 m w-s/cm2 with 2 lamps
|
| UV effective chamber size |
15"
dia x 3" high
|
14"
x 15" x 10"
|
|
Micro watt sec/cm squared of effective irradiation power used for killing airborne pathogens |
741
|
12,456
|
This unit has a small 6" long, 10-watt UV lamp. It is mounted in a chamber that is shared by the motor and the motor housing shadows half the chamber. Therefore, the effective UV is reduced because of this shadowing. The calculation takes this shadowing and the reflectivity of the chamber into account. Also, the air passages to get to the UV from the HEPA filter are less than 3/8" and the chamber is only 3" high, meaning the air velocity through the chamber is a very high 7 feet per second at the 320 cfm airflow. Therefore, the residence time for the UV to act on the pathogens would be less than a tenth of a second. The irradiation power even at low speed would still only be 4,742 m w-s/cm2. The CARE would be 43,600 m w-s/cm2 at low speed.
The airflow pattern set up with the supply air out the side is poor. When on low speed, short cycling of clean air is prevalent. Clean air must be directed into the breathing zone. This way people are breathing the cleanest air possible, all the time.
The airflow rate is listed at 400cfm. The measured airflow is actually 320 cfm. This speed is noted as turbo and does indeed sound like a "turbo" / jet engine. The unit would not typically be used on high speed because of the noise; one actually could not carry on a conversation. Medium speed is much lower at 100 cfm.
The "whisper" setting the manufacturer states is for night time/sleep and is so low that no real, effective air changes are made and at minimal air cleaning. CFM is tested at 52 cfm.
Filter changing is not indicated with any type of monitor. The CARE is by actual pressure drop across the filter.
The mfg advertises a sophisticated, high efficiency motor, which is really a standard everyday 3-speed type.
This unit seems to have been developed for connection onto a ducted HVAC system. The bright yellow school bus color may be nice in the basement but doubtful it being used in a living room, or NYC office
