Honeywell F90B Outdoor Air, F90 Coanda air flow pattern, F90 mounting considerations, Solution

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

F90

F90

F90

F90F90

F90

M923

Fig. 5. F90 Coanda air flow pattern.

Outdoor Air

DANCE FLOOR

STAGE F90

LOW SMOKING LEVEL AT ￿ STAGE AND DANCE FLOOR. ￿ USE ONE F90.￿

￿

HEAVY SMOKING LEVEL AT ￿ TABLES AND BAR.￿

USE THREE F90s.

F90

T

A

F90 B L

E

S

F90

BAR

M1528A

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

Fig. 4. F90 mounting considerations.

be provided as required.

Example 1. Sizing by Air Changes per Hour and Room Volume

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.

AIR ￿

CHANGES ￿

PER HOUR

	25
	20
BARS
	15
CAFETERIAS￿
BOWLING￿LUNCHEONETTES
CENTERS
RESTAURANTS	10						10
							9
PLACES OF￿
							8
ASSEMBLY
							7
STORES￿	5						6
OFFICES							5
							4
							3
							2
	0						1
	10,000￿	20,000￿	30,000￿	40,000￿	50,000￿	60,000￿	70,000￿
	[283]	[567]	[850]	[1133]	[1416]	[1700]	[1983]

F90As REQUIRED

ROOM VOLUME IN CUBIC FEET AND [CUBIC METERS] M1524

5 68-0103-6 Revised 11-07