Why is negative pressure important to construction projects?
A negative pressure environment will help to contain the construction
dust and contaminants within the construction space. A negative pressure
space eliminates the possibility of contaminants passing outside of the
construction area through leaks in the construction barriers.
Which size Abatement Portable Air Scrubber
is needed for my current project?
Six or more air changes per hour (ACH)
are recommended for effective air cleaning during construction and
renovation work. To determine the amount of airflow and the number
of PREDATOR or HEPA-AIRE PAS units required for your project, view
the air change calculator for facility construction and renovation
in healthcare facilities.
How is the amount of airflow that must
be removed from the containment zone to maintain negative pressure
The general rule of thumb is that
at least 10% more air must be exhausted from the area than is supplied
to it. For example, if 500 CFM is coming in through the facility HVAC
system, then at least 550 CFM must be filtered and exhausted by the
Why do I need to monitor room pressure
where I am removing airborne particles, odors and infectious diseases?
Air flows from a higher pressure to
a lower pressure. The PREDATOR or HEPA-AIRE PAS creates a negative
pressure in the room so that airborne particulates are pulled towards
it and filtered out. The negative pressure prevents particulates from
leaving the room you want to cleanse and contaminating adjacent areas.
Room pressure differences must be monitored and maintained to be effective.
The most reliable and sure way to confirm that pressure relationships
are correct is to continuously monitor differential pressure using
Abatement’s PPMT Portable Differential Pressure Monitor.
What if we don't/can't exhaust the filtered
air to the outside?
Since Abatement Technologies Portable Air Scrubbers pull the air
through a true HEPA filter tested and certified to a minimum efficiency
of 99.97% @ 0.3 microns before it is exhausted from the containment
space, there is no requirement that they be exhausted to the outdoors.
Will Abatement PREDATOR and HEPA-AIRE
Portable Air Scrubbers remove odors?
Yes, when equipped with special 2-inch
deep VAPOR-LOCK® carbon filters available for all PREDATOR
and HEPA-AIRE PAS models. These high-performance filters provide substantially
more absorption capacity than most other carbon filters, and meet most
odor control requirements. Special carbon blends are also available
for capturing odors from low molecular weight compounds for which carbon
has limited effectiveness.
Which particulates can Abatement Portable
Air Scrubbers capture?
All models (PREDATOR and HEPA-AIRE)
are equipped with HEPA filters that are tested and certified to remove
99.97% of particles that are 0.3 microns and larger, to provide "operating
room clean" filtered air. To put this in perspective, the diameter
of a human hair is 50 to 200 microns, and fungal spores are typically
five to 25 microns. For a complete list of particulate contaminants
and odors that the Portable Air Scrubber can remove, please Contact
with your fax number.
Why is HEPA filtration required during
construction and renovation projects?
According to the latest 2003
CDC Guidelines for Environmental Infection Control in Health-Care
, HEPA filtration is required for the capture of microbial
spores and other contaminants that can potentially cause fungal infections
and Aspergillosis. Airborne bacteria and fungi are typically 3 microns
(0.0001”) and smaller in size, small enough to easily pass through
most filters. Air filtration devices must therefore be equipped with
true HEPA (High Efficiency Particulate Air) filters, designed to
capture at least 99.97% (9,997 out of 10,000) particles as small
as 0.3 microns (0.00001”) in size.
Are there any special requirements for
HEPA filters used in healthcare facilities?
Yes. To meet Institute of Environmental
Sciences and Technology IEST-RP-CC001.3 standards for Type A 99.97%
efficiency HEPA filters, each and every completed filter must be individually
tested for leakage and resistance, to detect any leaks in the media
or between the media and the frame or other problems that can compromise
the integrity of the completed filter. Test results must be shown on
a label on the filter frame. Filter frames should be metal. The 2003
CDC Guidelines state that: “Wood (HEPA frames) can compromise the air
quality if it becomes and remains wet, allowing the growth of fungi
and bacteria,” and recommends replacing these filters with metal-frame
filters. Filters should also meet UL900 Class II flammability requirements.
What are the differences between Abatement
Portable Air Scrubbers and Negative Air Machines?
We manufacture both types of products.
Although they perform similar functions, they have distinctly different
designs and markets. Big, boxy and heavy negative air machines with
‘no frills’ designs and hard casters are lower priced, but are best
suited for large projects in unoccupied facilities. Abatement PAS have
a much lighter weight, upright design that makes them much more portable
and easy to roll into and maneuver through tight spaces with minimal
disruption to an occupied facility. Higher performance motors, blowers
and filtration systems substantially improve airflow output and filter
life, and reduce operating costs. More elaborate controls and high
tech stainless steel cabinets that look great and are easy to clean
add to their ‘hospital friendliness’. Learn more about Abatement Technologies
line of high-performance PREDATOR and HEPA-AIRE Series Portable
Can Abatement Portable Air Scrubbers also
be used to filter and recirculate air or for positive pressure?
Definitely. Abatement PAS units can
be used to continuously filter and recirculate 100% of the filtered
air within the construction area. This will boost the ACH in the room
and provide HEPA filtration, but will not change room pressurization.
All models can also be configured to create positive pressure. See
air cleansing and recirculation animation.
Does Abatement Technologies offer any
solutions for capturing and removing particles that drop out of the
air and land on walls, floors and other surfaces?
Yes. Surfaces should be frequently
cleaned with a HEPA vacuum to further reduce the chance that harmful
particles could migrate out of the area and become airborne again.
Abatement Technologies offers two HEPA vacuum models, the V8000WD
Canister Style, Wet/Dry HEPA Vac
and the V1300H
Hip-Mounted HEPA Vac
How often do Abatement HEPA filters need
to be changed?
The size and concentration of airborne contaminants, temperature,
humidity conditions and duration of use determine how often filters
need replacement. As the filters become loaded with particulate matter,
the airflow capacity of the unit decreases and the static pressure
differential across the filter increases.
Abatement Portable Air Scrubbers are equipped with easy-to-read
filter change indicator lamps that illuminate when filters should
be replaced. Unlike gauges, these lamps do not require operator interpretation
or calculations. Average filter life (with continuous operation):
filter: 1 day
- Secondary filters: 3-7 days
- HEPA filter: 800 hours
What are the total cost-savings of using
Abatement PAS versus the competition?
Abatement PAS can potentially save users up to $10,000 or more over
the life of the unit compared to other systems, including low-priced
(and generally low-quality) “economy” products. Four main factors
contribute to these savings:
- Longer filter life because the filters
provide exceptional dirt-holding capacity
- Lower replacement filter
- Lower labor costs due to higher productivity
- Minimal downtime. By
any measure, this is an excellent return on investment.
What does Abatement mean by “aircraft-type
Our stainless steel units are manufactured
using solid rivet construction, for the same reasons aircraft manufacturers
use them–solid rivets are exceptionally strong, durable and leak-resistant.
In addition, closed-cell neoprene gaskets between the two layers of
metal further ensure that critical seams are airtight. Sheet metal
screw, hollow pop rivets, or nuts and bolts are far cheaper, but they
are also far more prone to failure and leakage. Would you want to fly
on an airplane made that way?
What Abatement accessories are needed
for negative pressure applications?
PREDATOR and HEPA-AIRE Portable Air
Scrubbers include an exhaust collar and a special locking clamp for
attaching flex duct to the collar. Flex duct and other items are sold
as accessory products.
What is the warranty of Abatement Portable
All systems are covered by a comprehensive
limited warranty to the original user against defects in materials
and workmanship for a period of one year after date of purchase. This
warranty excludes filters, which are consumable items that require
What is the estimated shipping time of
We do our best to keep all Abatement
Portable Air Scrubbers in stock for same day or next day shipment when
possible. Approximate shipping time within the continental United States
is two to seven days. You will be notified immediately of the estimated
delay should we experience extremely high demand and the system you
order happens to be out of stock.
FAQs about Product Safety Certification
You really emphasize the fact that Abatement
products are tested and certified by ETL, a Nationally recognized testing
Laboratory (NRTL). What are the requirements?
In the USA, OSHA safety standards
for general industry and construction and the National Electrical Code
require testing and listing (certification) of electrical products
to applicable standards. It is important to note that this testing
must be performed on an electrical device even if the individual electrical
components used in that device are all listed or approved. Testing
must be done by an OSHA-recognized NRTL, such as UL (Underwriters Laboratories),
ETL (Environmental Testing Laboratories) or CSA (Canadian Standards
Association). In Canada, The Standards Council of Canada has adopted
standards for the Canadian Electrical Code developed on its behalf
by the Canadian Standards Association (CSA). Third party testing from
a laboratory or other organization not NRTL-certified is not acceptable,
even if such testing is done to applicable standards.
Why is NRTL certification so important?
Unless a unit is properly tested,
users have no way of knowing whether it is properly and safely designed
to meet the requirements of the applicable electrical codes. It is
wise to require written vendor verification that the products you purchase
are NRTL certified.
Aren't all air filtration products properly
No. Unfortunately, many of the air
filtration systems sold to and used by contractors, healthcare facilities
and others are not certified, especially negative air machines.
FAQs about HEPA Filters
Commonly Asked Questions about HEPA Filter Performance & Testing
What does the term HEPA mean?
HEPA is an acronym for "High
Efficiency Particulate Air" or "High Efficiency Particulate
Arrestance." This acronym refers to a filter that is manufactured,
tested and certified to meet Institute of Environmental Sciences and
Technology (IEST) construction, performance and certification standards
as currently published in IEST RP-CC001.3.
How long have HEPA filters been in use?
The first HEPA filters were developed
for the Atomic Energy Commission during World War II for use in facilities
manufacturing components for the Manhattan (atomic bomb) project. These
HEPA filters were originally designed to capture microscopic radioactive
particles too small for effective removal by existing types of filters.
HEPA filters used today are much more efficient and economical than
the products made in the 1940's.
Where are HEPA filters used today?
HEPA filters are generally specified
for applications where microscopic airborne particles or biopollutants
could cause human health or product quality problems. Typical users
include military, nuclear, pharmaceutical, electronics, biological
and medical facilities.
What is it that makes HEPA filters so
The ultra-fine, glass-fiber medium
captures microscopic particles that can easily pass through other filters
by a combination of diffusion, interception and inertial impaction.
To qualify as a Type A HEPA filter, the filter must capture at least
99.97% (9,997 out of 10,000) of particles 0.3 microns in size–about
300 times smaller than the diameter of a human hair, and 25 to 50 times
smaller than we can see. To a HEPA filter, catching a one-micron particle
(1/1,000,000 of a meter) is like stopping a cotton ball with a door
Are filters this efficient really necessary
for IAQ applications?
Laser particle counter measurements
typically show that more than 99% of the particles suspended in indoor
air are one micron (1/1,000,000 of a meter) or smaller in size. EPA
calls these “lung-damaging” particles, because they can lodge deep
in the lungs when inhaled. The ability of HEPA filters to capture particles
this small is what sets them apart from other types of filters. Regulations
developed by EPA, OSHA, CDC and other federal, state and local government
agencies responsible for human health and IAQ issues specify HEPA filters
for asbestos, lead and mold abatement, TB and SARS isolation rooms
and healthcare renovation projects.
Are all filters made with HEPA filter
media HEPA filters?
Manufacturing a filter with HEPA filter
media does not mean that the filter itself meets true HEPA efficiency
requirements. Serious filter leakage can go undetected if filters are
not individually tested and certified at the end of the manufacturing
process. Even the tiniest pinhole leaks in the media or breach of the
seal between the media pack and the filter frame can cause the filter
to fail IEST requirements. The testing requires very specific procedures
using a thermally generated mono-dispersed aerosol and a laser particle
counter. Some regulations also require field-testing by the user prior
to going into service and periodically thereafter.
Why is the testing done with a 0.3-micron
particle size test aerosol?
Filter efficiency studies have shown
that 0.3-microns is the "Most Penetrating Particle Size (MPPS)" for
HEPA filter media. Efficiency is typically greater than 99.97% against
larger or smaller particle sizes. Particles larger than 0.3 microns
are typically more easily trapped, or intercepted, by the media. Smaller
particles often lack sufficient mass to penetrate the media.
Is a "HEPA-Type" filter the
same as a HEPA filter?
No. In fact, the differences are huge.
According to the American Lung Association, filters classified as "HEPA-type" filters
may capture as little as 55% of 0.3-micron particles (5,500 out of
10,000). By this definition, the true HEPA filter could be more than
1,800 times as efficient as the "HEPA-type" filter.
Does HEPA filter efficiency decrease as
the filter gets dirty?
No. Unlike electronic air cleaners
and other air purification technologies that experience substantial
loss of efficiency as they become dirty, exactly the opposite typically
happens with HEPA filters. In fact, the dirtier a HEPA filter gets,
the more efficient it can become.