Look for links to printable pdf
literature in equipment specifications sections, above in this column, & on
Negative Pressure Isolation Rooms Hospital
Grade HEPA Air Cleaners & Filters for 2009 H1N1 Swine Flu, TB, & other
Negative & Positive Air Pressure
Control and HEPA Filtration for Isolation Rooms and
Other High Risk Areas in Hospitals, Medical, &
Corrections/Law Enforcement Facilities
(Negative Pressure Version Shown)
[May be customized to
prevent inmate tampering for use in a correctional facility]
We strongly recommend the
Model XJ2 Hospital Grade HEPA air cleaner for critical applications such as
isolation. The XJ2 was engineered from the bottom up with isolation
applications in mind. The design has been independently laboratory
verified to deliver HEPA system efficiency from intake to exhaust at
delivered air flows of up to 1,000 CFM (cubic feet per minute). In
it's standard form the XJ2 is configured for negative pressure isolation and
is supplied with flexhose as part of the included window kit. It may
also be configured for filtration and recirculation by upgrading to the
recirculation exhaust plenum and dropping the window kit from the
Airborne infection isolation room (AIIR),
commonly referred to as a negative pressure
isolation room, has the following requirements:
- The isolation room air should be
filtered at a rate of 12 times per hour, and,
- The air should move from the
adjoining areas into the isolation room.
- The ideal differential pressure
between the isolation room and adjoining areas is greater than -2.5
Pa (0.01″ water gauge).
typical hospital room is 14'x12'x8', or, 168 sqft with a 8 ft ceiling
In order to meet requirement #1
of 12 air filtrations per hour:
- 269 cubic feet per minute (CFM) of
HEPA filtered air flow is needed.
In order to meet requirement #2
for achievement of proper negative pressure:
- The HVAC system should be
providing at 6 - 8 air changes per hour (ACH). Assuming 8 ACH,
this corresponds to:
- 180 CFM estimated for the Room
dimension 14'x12'x8' ==> 180 + 50 = 230 CFM exhausted for negative
The selection of equipment should be
based on the requirement above which has the higher air flow value.
In this case, requirement #1 or 269 CFM, is the target design
value. The hospital grade HEPA air cleaning equipment we are
proposing significantly exceeds these values and allows for soiling of
filters with concomitant reduction of airflow as well as air flow
reduction due to drag introduced by some ducting of the filtered
exhaust. In other words, the Model XJ2 could easily be operated
at half it's rated air flow and meet the requirements with relatively
Additional information about room
pressurization is available on our website at:
- Model XJ2 Portable
Hospital Grade HEPA air cleaner
- Delivered Airflow: up to 1,000
CFM (infinitely variable)
- Certified HEPA (99.999% @ 0.3
micron) system efficiency; not just the filter, although the XJ2
HEPA filter also carries it's own certification.
- XJ2 equipment has been
independently tested in its entirety and proven to be HEPA
efficient as a complete unit, to 99.999% @ 0.3 micron
efficiency, from intake to exhaust.
- Backwards inclined blower to
resist drop off in airflow as filters soil.
- May be used for positive or
negative pressure as well as recirculation
- Optional tamper proof locking
cover for the speed control
- Reputation for quality and
- Optional Differential Room
Pressure Monitor (3rd page of above link)
Note that UVGI is not required by CDC
and is not a substitute for HEPA efficiency performance. The
only requirement for the air cleaner is that it perform at HEPA
efficiency from intake to exhaust. Also see
XJ2 & UV light.
information from Center for Disease Control (CDC) - opens in new
Model XJ-1000 has undergone a redesign to further improve performance and
has been redesignated the Model XJ-2. Although the XJ-2 is essentially
the same as the retired XJ-1000, there are some differences.
The revised product brochure for the XJ-2,
representing the latest information, is available by
Original Model XJ-1000 information follows:
Affordable and portable, compact
and quiet, the new XJ-1000 assists you in complying with the CDC guidelines for
converting ordinary patient care rooms into negative-pressure TB isolation
New medical-grade room air purifier is suitable
- Extended-Care Facilities
- Retirement Settings
- Institutional Use
The XJ-1000's quiet operation design
features include: 1) a backward curved, dynamically balanced impeller, 2) the
quietest Air Volume Control in the industry, and 3) a sound-dampening blower
baffle. Sound levels are reduced to as low as 35 dBA at 114 CFM and only 66 dBA
at 775 CFM.* The Air Volume Control also allows your staff to regulate the fan
speed to minimize air flow sound. This feature is especially useful when smaller
room sizes allow lower air flow rates while still complying with the 12 air
changes per hour (12 ACH) specified in the CDC Guidelines.
*As per accepted industry practice, sound was measured 4'
away from the XJ-1000 and includes normal background noise.
The new 3M Filtrete™
prefilter protects the XJ-1000's certified High Efficiency Particulate Air
Filter (HEPA), ensuring maximum filtration efficiency. This highly-efficient
pre-filter reduces maintenance costs, allowing longer life for the HEPA filter.
Our Digital Room Pressure Monitor accessory gives the
CDC-specified position verification that the XJ-1000 is maintaining negative
pressure in the isolation room.
The new XJ-1000 is quick and easy to
install. It is available in negative pressure, positive pressure, and
recirculating models. For the popular negative pressure option: 1) roll the
XJ-1000 up to the room's window opening, 2) insert the vent adapter in the
window opening, 3) connect the flexible duct, and 4) plug it in! Removing
microorganisms from up to 1000 cubic feet of air per minute, the XJ-1000 will
provide the CDC-specified 12 ACH for rooms of up to 555 square feet with
nine-foot ceilings. With dimensions of only 52¼" tall, 26½"
wide, and 14" deep, the XJ-1000 can handle large rooms up to 20' by 27'.
- Easy Installation/Compact Design
XJ-1000 Recirculating Version
When negative-pressure ventilation is not
feasible due to building constraints, the recirculating model facilitates
compliance with CDC Guidelines for interior rooms. The XJ-1000's certified
99.97% efficient HEPA filter allows recirculating air filtration and microbe
removal. In addition, positive pressure configurations are available. All
versions of the XJ-1000 are available as either upflow or downflow models to
suit your facilities specific requirements.
- Wall-Mounting Brackets may be ordered
instead of standard wheeled base for tight quarters or when floor space is
limited. The XJ-1000 may be mounted either vertically or horizontally.
- Room Pressure Monitor
digitally displays either positive or negative pressure within a room.
- Security Cover is available for
placement over the control panel. This clear, molded, plastic cover comes
with two keys.
- Conversion Kits for changing a
negative or positive XJ-1000 into a recirculation unit.
Quiet backward curved, dynamically- balanced impeller and sound-dampening
blower baffle reduce to minimum levels.
The XJ-1000's top-quality variable voltage air volume control is silent
in operation (no triac-speed controller motor hum). Large,
ergonomically-designed Air Volume Control Knob provides infinitely variable
control to precisely calibrate the XJ-1000's air flow to the room size.
Mini-helic pressure gauge monitors filter status.
Convenient heavy duty quarter-turn fasteners stay on access panel during
service. No screws to be lost when changing the 3M Filtrete™
prefilter or the HEPA filter.
Shown Photo C above, perforated exhaust port covers are included with the
XJ-1000 (negative or positive configuration only. If room conditions allow,
these may be used to balance isolation room negative pressure with
partial recirculation to minimize heating/cooling costs while meeting CDC
Shown Photo D above, built-in handles on door and front of unit access
to filters for quick and easy change-out.
- Features not shown
- Uniform pressure for the critical HEPA
filter seal is ensured by a) filter bracket geometry, and b)
positive application of pressure by locking screws (other units simply wedge
the HEPA filter in place).
- XJ-1000 is shipped fully-assembled
and ready for roll-in installation.
- The XJ-1000 total recirculation model has a
plenum configured for minimum sound levels consistent with maximum room air
||140 lbs. installed
||Adjustable from 115 CFM to
||Preset Points in Air Volume
||Max: 1000 CFM at 1.4" water
||High: 775 CFM at 1.0" water
||Med: 400 CFM at 0.5" water
||Low: 114 CFM at 0.1" water
||HEPA (99.97% DOP efficient at
(80-85% ASHRAE efficient)
||Mini-helic 0" to 3" range
||115 Vac, 60Hz, 4Amps, 400 Watts
||(At 4 feet from XJ-1000)
||Negative and Positive
||Low Speed: 35d8A, Med Speed: 56
dBA, Hi Speed: 66 dBA
||Low Speed: 37 dBA, Med Speed:
57 dBA, Hi Speed: 68 dBA
||Heavy-gauge, welded steel
cabinet with Autumn White, hospital-grade, powder coat finish.
||Standard base includes four
swivel casters. (Optional wall mount brackets may be ordered instead of
||Negative Pressure Upflow
||Negative Pressure Downflow
||Positive Pressure Upflow
||Positive Pressure Downflow