F118
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 m3/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.
DISTANCE FROM STRUCTURAL
CEILING TO DROP
ALIGN AIR CLEANER WITHCEILING – MINIMUM 12 INCHES WALLS, IF POSSIBLE
AIR PATH | AIR PATH |
RECOMMENDED FOR ROOMS
LESS THAN 16 FEET HIGHM16209A
(FLOOR TO STRUCTURAL CEILING )
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.
CORRECTINCORRECT
M16207A
Fig. 3. Arranging air cleaners in a large area.
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