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F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER
68-0103-6 Revised 11-07
6
Example 2. Sizing by Occupant Load
A cocktail lounge averages 85 occupants. How many F90As should be installed?
Solution:
F90As Required = ASHRAE Recommended Air Circulation/Minute
F90A Capacity
1. ASHRAE recommended minimum air circulation is 30 cubic feet per minute (cfm) (0.85 m
3
/minute) per person. For 85
people, the recommended air circulation would be: 85 people x 30 cfm (0.85 m
3
/minute) per person = 2550 cfm (72 m
3
minute).
2. F90A capacity (HI setting) is 1250 cfm (35 m
3
/minute).
Number of F90A's Required =
2550 cfm = 2 F90A's 72 m
3
/minute = 2 F90As
1250 cfm 35 m3/minute
3. Clean outdoor air is also required to replenish oxygen and dilute gaseous contaminants. 30 cfm per person is required for
bars and cocktail lounges.
EXAMPLE 3. Sizing by Air Changes per Hour and Room Volume
A shop proprietor wants to use F90As to remove high levels of smoke from the air. The shop is 25 x 40 feet (8 x 12 meters) with
a 15 feet (4.5 meters) ceiling. How many F90As are required?
Guideline: In the absence of other information, select the correct number of F90A units to provide between 10 and 20 air
changes per hour, depending on contaminant level. The F90As should be located directly above or as close as
possible to the source of contamination.
Solution:
F90As required =
Desired Air Circulation/Minute
F90A Capacity
1. Calculate the volume of the room: 25 x 40 x 15 feet = 15,000 cubic feet, (8 x 12 x 4.5 meters = 432 cubic meters).
2. Determine the volume of air to be circulated each hour. Ten air changes per hour are used here on the assumption that
the intent is to reduce, but not completely eliminate, smoke. 15,000 cubic feet x 10 air changes/hour = 150,000 cubic
feet/hour (432 cubic meters x 10 air changes/hour = 4320 cubic meters/hour)
3. Determine the volume of air to be circulated each minute:
150,000 cubic feet/hour = 2500 cubic feet/minute (cfm) 4320 cubic feet/hour = 72 cubic meters/minute (m
3
/minute)
60 minutes/hour 60 minutes/hour
4. F90A capacity (HI setting is 1250 cfm (35 m
3
/minute).
Number of F90As Required = 2500 cfm = 2 F90As 72 m
3
/minute = 2 F90As
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to assure the product is suitable for your
application.
3. Assure the installer is a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
WARNING
Explosion Hazard.
Can cause property damage, severe injury, or
death.
1. Do not install or use the F90 where there is any
danger of gas, vapor, or dust explosion.
2. Do not install or use the F90 if explosion-proof
fixtures are specified.
Sharp Edges.
Can cause personal injury.
Wear protective gloves while handling the cells and
prefilter to avoid cuts from the sharp metal edges,
collection plates, and ionizer wires.
WARNING
Must be installed by only a Honeywell trained
installer.
1250 cfm 35 m
3
/minute