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Frequently Asked Questions

ColPro for Buildings

1. What pressure (overpressure) level is needed for building ColPro?
ColPro zones - or safe rooms - are often maintained at positive pressure relative to the outside or adjacent spaces. This overpressure ensures that air will always flow from the zone through any leak paths that are not sealed. Overpressure levels vary according to many factors, including local weather, building attributes, and other requirements that govern the project. New World can help you specify or design a ColPro system to meet your needs.

2. What are air locks and how are they used?
Air locks are vestibules that allow safe ingress to and egress from pressurized ColPro zones. Air locks have two doors that must be opened one-at-a-time to maintain positive pressure within the protected zone. Air locks often feature an air purge to flush airborne contaminants that may enter when the outside door is opened. New World can help with the design and implementation of air locks and purge controls.

3. Do you offer CBR filter installation and testing services?
Yes. New World’s Field Service Team is available to perform both CBR filter installation and in-situ leak tests based on the requirements of ASME N510. We have the equipment and trained personnel to conduct both aerosol and gas leak tests on nearly all radial-flow filter systems, including systems installed by the U.S. Army, U.S. Navy, and the U.S. Army Corps of Engineers. We can also balance ventilation systems to design flow rates and conduct pressurization tests.

4. Do you suggest periodic filter system surveillance tests?
Yes. Surveillance tests are often performed annually to verify filter system integrity. We can help you design a surveillance test program as well as provide routine maintenance and service items, such as bag prefilters.

5. How long do CBR Filters and bag prefilters last?
There are many factors that affect the service life of CBR filters, such as local weather conditions, system flow rates, whether the system operates full-time or part-time, and the nature of the threat being protected against. CBR filters may last as long as three years, while bag prefilters typically need replacing at six-month intervals. A surveillance program can help assess filter service life for your installation and operating conditions.

6. Are your CBR filter systems suitable for vehicles and tents?
Our lightweight OpenAire CBR filter system can be packaged in many ways - with our without integrated fans - to meet a variety of applications. These filter systems can be used in trailer-mounted applications for protecting expeditionary forces, and for creating positive and negative pressure environments for field hospitals and command centers. Our OpenAire Marine CBR filter system offers a high level of corrosion protection for assured long-term performance.

ColPro for Ships

1. What pressure (overpressure) level is needed for ship ColPro?
ColPro zones - or safe rooms - are often maintained at positive pressure relative to the outside or adjacent spaces. This overpressure ensures that air will always flow from the zone through any leak paths that are not sealed. Overpressure levels vary according to many factors, including local weather, mission, and ship specification documents. New World can help you specify or design a ColPro system to meet your needs.

3. Do you offer CBR filter installation and testing services?
Yes. New World’s Field Services Team is available to perform both CBR filter installation and in-situ leak tests based on the requirements of ASME N510. We have the equipment and trained personnel to conduct both aerosol and gas leak tests on nearly all radial-flow filter systems, including the U.S. Navy’s Ship Collective Protection System (CPS) and Selected Area Collective Protection System (SACPS). We can also balance ventilation systems to design flow rates and conduct pressurization tests.

4. Do you suggest periodic filter system surveillance tests?
Yes. Periodic surveillance tests are recommended to verify filter system integrity in-between normal filter replacement intervals. Surveillance tests provide confirming evidence that the filter system is operating at or above its design requirements. These tests may involve aerosol leak tests and/or gas leak tests, and other inspections. New World can help you design a surveillance program. Our Field Service Team is trained to perform inspection and maintenance of CBR filter systems.

6. Does New World’s ColPro equipment meet military-grade requirements?
Much of it does. New World’s ColPro experience grew out of our development of ship equipment designed for survivability against mechanical shock (Mil-S-901 Grade A), vibration (Mil-Std-167), salt spray and fog, and other rigorous requirements. We manufacture and supply equipment to shipyards and contractors that require this performance pedigree.

Aerosol & Gas Filtration Systems

1. What is the difference between the OpenAire (SS) CBR filter system and the OpenAire (AL) CBR filter systems used in ColPro applications?
The main difference is that the OpenAire™ (SS) filter systems are constructed of high-grade (304 and 316) stainless steel for assured performance in applications where decontamination solutions will be likely used. These systems also have one filter cover per housing rather than two. This allows for mounting the M98 gas filter or, because of its identical size, the OpenAire™ HEPA Filter. Finally, these systems have solid front covers with air flowing in through the back and out through the top, side, or bottom. This allows filter servicing outside of the process airstream.

2. Will the radial flow CBR Filter Set fit in the OpenAire (SS) CBR filter system?
The OpenAire™ (SS) CBR filter system was specifically designed to hold the M98 gas (but not HEPA) filter. In applications where both aerosol and gas filtration are required, we recommend use of an upstream HEPA filter bank. If only aerosol filtration is needed, consider using the OpenAire™ HEPA Filter, which features the same dimensions as the M98 gas filter.

3. How do I determine what size OpenAire (SS) CBR filter system I need?
New World’s radial flow CBR filter systems use the M98 gas adsorber, the larger filter element in the CBR Filter Set. The nominal flow rate of this adsorber is 200 cubic feet per minute (cfm). However, some specifications require a flow rate of not more than 150 cfm per filter. The OpenAire™ (SS) CBR filter system features a bank of filter housings (or tubes) that can be built for filter element positions to 6 filters deep for a nominal flow rate of 1,200 cfm per housing at a flow rate of 200 cfm per filter, or 900 cfm per housing at a flow rate of 150 cfm per filter.

4. What is dwell time?
Dwell time, also known as "residence time", is the length of time it takes for air to pass through a gas filter element. Longer dwell times generally result in greater gas adsorption as the air remains in contact with carbon for a longer period.

5. Are there air flow variations in a filter system?
There can be if not accounted for in design and system balancing. There are three components of flow variation in a filter system: (1) filter-to-filter variations due to manufactured differences in filter flow resistance (pressure drop), (2) variations in the position of a filter element in a filter housing (front-to-back variations), and (3) variations in the position of a filter housing due to its location in a filter bank (side-to-side variations). It is important to minimize variations to ensure that air does not preferentially flow through one or more filter housings, effectively creating "hot spots" where the actual flow rate would exceed design objectives.

6. How does New World predict flow variations in a filter system?
For new design, we use computational fluid dynamics (CFD) to predict flow rates and pressure drops through a filter bank. Our models include the filter system, connecting ductwork, and other features that would affect the outcome. New World has developed a proprietary model definition of the CBR Filter Set that can predict flow and pressure gradients. The results of this analysis point to design changes that would yield more balanced flow. It is easier and less costly to make changes in the design phase rather than uncover and correct problems in the field after systems are built and installed.

Field Services

1. Do you service Collective Protection Systems (CPS) on U.S. Navy ships?
Yes. We have a long history of supporting the U.S. Navy in balancing, testing, and troubleshooting CPS installations and familiarity with many ships. We can assist with CBR filter replacements, in-situ leak tests to Navy procedures, zone boundary leak assessments, and system troubleshooting. We stock most common replacement parts for CPS equipment - including prefilters, gaskets, and filter housing hardware.

2. Is your Field Services capability limited to CBR protection systems?
No. While CBR protection is a specialty area, our Field Service team is often called up to tackle a range of maintenance and troubleshooting tasks with comprehensive testing capabilities that include: pressure, temperature, sound, shock, vibration, and airflow. Our mobile support allows us to diagnose, repair, and maintain products as well as perform upgrades requiring mechanical fabrication and welding.

3. What Field Services do you offer for building ColPro systems?
We offer a range of start-up, testing, troubleshooting, and maintenance services including: installation and replacement of CBR filters and prefilters; in-situ filter system leak tests to ASME N510; air flow measurement and balancing; boundary leak assessments and sealing; blower-door testing to ASTM E779-03; noise and vibration evaluation and abatement; and more! For more information, call us at 540.373.1435.

4. What Field Services do you offer for mail security systems?
We offer a range of preventative and corrective maintenance services including: maintenance of fans, pumps, and compressors; installation and replacement of CBR filters and prefilters; in-situ filter system leak testing to ASME N510; air flow measurement and balancing; mail sorter and jogger maintenance; noise and vibration evaluation and abatement, and general facility maintenance. For more information, call us at (540) 373-1435.