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Maintenance
When to Change Filters
It is impossible to predict EXACTLY when filters must be changed
The Pressure gauge on the Panel will provide a guide. For this test, the Inlet
must be open, without the Restrictor Plate. When the Air-Care Sentinel is first
installed at a new location, turn it on and note the reading on the pressure gauge
(usually 3.0 to 3.5). Next block the 12” inlet with a piece of cardboard and again
note the meter reading (Usually 4.8 to 5.0).
While operating, the pressure gauge should ALWAYS remain at least 0.6” WC
LOWER than the Blocked reading (usually 4.0 to 4.4). Another indication that
filters need to be changed is when the pressure gauge reads more than 1” WC
HIGHER than the initial reading when the inlet is fully open (Usually 3.0 to 4.5).
The NORMAL pressure reading with the 4” dia. Restrictor Plate installed is 4.4.
When planning the number of pre-filters to have on hand for a job that involves
heavy demolition with significant dust and debris in the area, the change cycle
could be:
First Pre-filter:
every 3-4 hours, (2” white)
Secondary Pre-filter:
every 14 Hours, (1/4” white)
HEPA
every 800 hours (33 days at 24 hr/day).
It is also advisable to thoroughly decontaminate the Air scrubber after each job and
start each job with a clean set of filters.
Determine Project Requirements for
Air Scrubbers
Room size vs. Number of Sentinel 1500 required for 4 air changes per Hour
Room Size
(8’ to 12’ Ceilings)
Cubic feet of Space CFM Required for
4 Air Changes/ Hr
Required number of
Sentinel 1500’s
From 20’ x 40’
to 25’ x 50’
6,400 to 15,000
535 to 1250
1 with Restrictor
to 1 without restrictor
From 25’ x 50’
to 50’ x 75’
10,000 to 45,000
835 to 3750
1 to 3
From 50’ x 75’
to 75’ x 100’
30,000 to 90,000
2,500 to 7,500
2 to 5
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