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F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER
F90
F90
F90
DANCE FLOOR
F90
STAGE
LOW SMOKING LEVEL AT
STAGE AND DANCE FLOOR.
USE ONE F90.
HEAVY SMOKING LEVEL AT
TABLES AND BAR.
USE THREE F90s.
Fig. 4. F90 mounting considerations.
An office measures 40 x 45 feet (12 x 14 meters) with a 15 foot (4.5 meter) ceiling. How many F90As should be installed?
Solution:
1. Find the room volume: 40 x 45 x 15 feet = 27,000 cubic feet, (12 x 14 x 4.5 meters = 756 cubic meters).
2. Assuming seven air changes per hour, with 27,000 cubic feet (756 cubic meters) volume, the graph below indicates three
F90As are required.
3. Clean outdoor air is also required to replenish oxygen and dilute gaseous contaminants. 20 cfm per person is required for
offices.
BARS
CAFETERIAS
LUNCHEONETTES
BOWLING
CENTERS
RESTAURANTS
PLACES OF
ASSEMBLY
STORES
OFFICES
F90
F90
F90
F90
T
A
B
F90
L
E
S
F90
BAR
M1528A
Example 1. Sizing by Air Changes per Hour and Room Volume
AIR
CHANGES
PER HOUR
25
20
15
10
5
0
10,000
20,000
[283]
[567]
ROOM VOLUME IN CUBIC FEET AND [CUBIC METERS]
Fig. 5. F90 Coanda air flow pattern.
Outdoor Air
ASHRAE Standard 62-89 specifies that every commercial
space be provided with fifteen cfm per occupant of outdoor
air to replenish oxygen and dilute CO2. If other internal
sources of gaseous contamination are present, additional
outside air is needed to dilute the contamination.
EXAMPLE: An office requires 20 cfm per person because
the standard estimates some smoking, some
copy machine operation, etc. The standard
assumes outdoor air will be cleaned to less
than 75 micrograms per cubic meter prior to
introduction into the space. ASHRAE Standard
62-89 states that supplemental air cleaning to
control smoke or additional outside air must
be provided as required.
30,000
40,000
50,000
[850]
[1133]
[1416]
5
M923
10
9
8
7
6
5
4
3
2
1
60,000
70,000
[1700]
[1983]
M1524
68-0103-6 Revised 11-07
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