Determining Room Re-Entry Time
Whenever possible, delay re-entry and allow treated room to remain unoccupied overnight. Otherwise,
select the appropriate room re-entry time directive for your facility:
A. If you have no handheld H2O2 sensor but a written protocol has been established by your organization
or an authorized Halosil Distributor for the room or for the class of similar rooms using a handheld H2O2
sensor, use the time established by that protocol.
B. If you have a handheld H2O2 sensor but no protocol, reenter the room after at least 90 minutes with PPE
to determine if the measured H2O2 level has dropped to about 1 ppm or below.
C. If no written protocol has been established and you have no H2O2 sensor, assume a waiting time of AT
LEAST 110 MINUTES AFTER FOGGING. (110 minutes is the minimum wait time. Length of wait time increases
with room size. See time chart below.)
Minimum Wait Times
Fog Time
Recommended MINIMUM Wait Time
10 minutes
110 minutes
15
120
20
130
25
140
30
150
35
160
40
170
45
180
50
190
55
200
60
210
Once the reentry time has been reached or exceeded, it is recommended that you open all doors, windows
(if any), unseal HVAC vents and restart your HVAC system to allow increased ventilation and airflow
circulation in the room. Uncover smoke detectors.
HaloFogger® Operation Manual_1911
Timer Setting
ft
3
m
3
Fog Times
(
based on room size)
1400 - 1,800
1,900 - 2,600
2,700 - 3,500
3,600 - 4,400
4,500 - 5,200
5,300 - 6,100
6,200 - 7,000
7,100 - 7,900
8,000 - 8,800
8,900 - 9,600
9,700 - 10,500
40 - 50
51 - 75
76 - 100
101 - 125
126 - 150
151 - 175
176 - 200
201 - 225
226 - 250
251 - 275
276 - 300
10
15
20
25
30
35
40
45
50
55
60
minutes