Air Quality Engineering MiracleAir CM-12, User Manual

Page: 4 / 10

4
Additional ventilation may be required for toxic
contaminants. In any event, the air cleaner must only
be used in areas that are ventilated for human
occupancy.
SIZING
Air cleaners are generally best sized according to the
use of the area and the volume of the room (Air
Changes per Hour method).
Secondary factors to consider in applying air cleaners
include:
•
Type of contamination
•
Number of occupants
•
Outside air quality
•
Anticipated fan setting
•
Rate of contaminant generation
By considering these factors, the number of air
cleaners required can be adjusted up or down to
account for abnormalities in operating conditions.
Follow Steps 1-4 below to determine the number of air
cleaners required:
Step 1 – Measure the length, width and height of the
room in feet.
Step 2 – Determine the Air Changes per Hour
required, ACH. See Chart A.
Step 3 – Determine the CFM (Cubic Feet per Minute of
Air). See Chart B.
Step 4 – Enter the figures from Steps 1-3 into the
Sizing Formula below and calculate the number of air
cleaners required.
CHART A – Air Changes Per Hour
Load Description of Application ACH
Light General offices & computer rooms 4-5
Avg Conference and break rooms 6
Heavy Designated smoking areas, bingo
halls, bars & extra smoky areas 8-10
CHART B – Cubic Feet of Air Per Minute
The air cleaner has a variable speed fan motor. Use the
CFM that corresponds to the speed that the air cleaner
will operate on normally.
Low Medium High
400 700 850
SIZING FORMULA
L x W x H of Room x Air Changes / Hr. = # of CM-12’s
CFM of Air x 60 Min.
CHOOSE LOCATION
To ensure even air distribution, the CM-12 draws air
into the center of the air cleaner and discharges air in
four directions as shown in the figure below. This
Coanda airflow pattern ensures that all air in the room
passes through the CM-12. See diagram below when
mounting the CM-12 to aid the air circulation already
established in the room. When airflow patterns are not
immediately apparent, observe the smoke from a
cigarette in various locations within the room.
The CM-12 should be mounted on the ceiling near the
center of the room. Divide larger rooms into sections
and use a CM-12 in the center of each section. In
rooms requiring varying levels of air cleaning,
concentrate the CM-12 where air cleaning is most
required.
The CM-12 should be installed on the ceiling in nearly
all applications. This is especially important when the
air cleaner is used for smoke control. Visible smoke
contains very small particles, so small in fact, that they
are not noticeably affected by gravity. Smoke usually
rises to the ceiling and hangs there.
CEILING MOUNTING
The mounting holes in the CM-12 are spaced 16”
between centers and 32” between centers to make it
easy to fasten the air cleaner directly to the ceiling
framework with 3-inch lag screws. Leave a space for
the power supply cord to run between the top of the
CM-12 and the ceiling. The power supply cord must
not be concealed above ceilings or behind walls.
Be sure that you select a strong structural part of the
ceiling. Do not fasten it to a false ceiling, plaster or
plasterboard. In some cases, it may be necessary to