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F118 IN-CEILING MEDIA AIR CLEANER
3 68-0209-2 Revised 11-07
PLANNING THE INSTALLATION
The sizing procedure determines the number of F118 needed.
The correct number required for a particular application
depends on:
— type of contamination.
— number of occupants.
— room volume.
— room use.
— outdoor air quality.
Assuming that the structural ceiling height is no higher than
16 ft (4.8m), one F118 set on high speed cleans 425 cfm,
25,500 cf/hr (723 m
3
/hr). The number of air changes per hour
determines the amount of air cleaning that occurs. Use the
following formula to determine the required number of F118
Air Cleaners:
Area of room in cubic feet/air cleaner cubic feet per hour x
desired number of air changes per hour.
For example, to compute the number of air cleaners that
would be required to clean an area of 30,000 cubic feet, at
the rate of four times per hour when operating on high
speed: (30,000/25,500 x 4 = 4.7).
Result: This area requires five F118.
For the most efficient operation, place the F118 as close as
possible to the contaminant source. For ambient air cleaning,
it is essential to establish a uniform airflow pattern throughout
the entire space. Physical limitations, such as the following,
may change the number of air cleaners required:
• If there is insufficient mounting space, fewer air cleaners
can be installed. If it is necessary to reduce the number of
air changes per hour, bring in more outdoor air to maintain
low contaminant levels.
• An irregularly shaped room does not allow even airflow,
and may require more air cleaners.
For questions about determining the number of air cleaners
needed, consult your local Honeywell Commercial Air Cleaner
Distributor.
Choose Location
The air cleaner is designed to hang from a structural ceiling. It
mounts horizontally, inside or outside of a drop ceiling system.
It also fits between joists set 24 in. (610 mm) on center. When
used with a drop ceiling system, allow at least 12 in. (305 mm)
clearance between the structural and drop ceiling to allow
space for the air cleaner. To ensure unobstructed airflow, the
grille, which is one inch (25 mm) deep, must protrude below
the drop ceiling surface.
The location and orientation of the air cleaner affects its
performance. Mount it in a location that allows airflow to reach
the extreme areas of the zone. See Fig. 2.
Fig. 2. F118 Air Circulation Schematic (Coanda Airflow).
The air cleaner is rectangular to align with the walls of any
rectangular space. When installing an air cleaner in a
rectangular space, place the length parallel with the room
length and the width parallel with the room width.
When a room requires only one air cleaner, hang it in the
center of the room.
Large rooms usually require more than one air cleaner. When
using several, divide the entire space into equal volumes and
distribute the air cleaners throughout the space so each air
cleaner circulates similar air quantities. To ensure optimum
performance of each air cleaner:
1. Use the formula above to determine the number of air
cleaners required for the large room.
2. Visually divide the entire room into several cubic vol-
umes. For example, if three air cleaners are to be
installed, visualize the room as approximately three
cubic volumes.
3. Consider each portion as a single room and install the
air cleaner at the center of each area. Align the air
cleaners to be parallel. See Fig. 3.
Fig. 3. Arranging air cleaners in a large area.
M16209A
AIR PATHAIR PATH
RECOMMENDED FOR ROOMS
LESS THAN 16 FEET HIGH
(FLOOR TO STRUCTURAL CEILING )
DISTANCE FROM STRUCTURAL
CEILING TO DROP
CEILING – MINIMUM 12 INCHES
ALIGN AIR CLEANER WITH
WALLS, IF POSSIBLE
CORRECT INCORRECT
M16207A