SysTech applies industrial air filter systems for a broad range of air filtration needs, from filtering exhaust air from a small blasting booth, as after-filters on dust collection systems, or for potent compound filtration at biological testing laboratories.
These air filter assemblies include a filter housing, transition(s) to a duct system, and air filter elements. The side access filter housings can be designed for all MERV rated panel filters, bag filter or HEPA and ULPA filters for the handling of high potency materials or return air systems. Integral fans can be included to create a stand-alone modular air filtration unit.
Air filters can be loaded on end and fixed in place with springs, or through side access doors for filter insertion and extraction or be configured for bag in-bag out (BIBO) features when handling potent or toxic compounds. MERV rated filters are typically used in series with up to four different efficiency rated filters. Air filters are selected on removal efficiency, size of particulate, loading, temperature and are often placed in series in housings for ease of handling and collection efficiency.
These filter assemblies are common in pharmaceutical plant applications, research labs, biotech, hospitals, on return air systems, and where handling sub-micron sized particles are part of the process.
Industrial air filter housing options include:
- Galvanized, aluminum or stainless steel construction
- Bag in – bag out features for potent or toxic compounds
- Flanged or slip fit inlet and outlet
- Duct transitions for inlet or outlet
- Gas-tight shut-off valves
- Pressure gauges
- Indoor or outdoor construction
- Crank or bolt style
- Integral fan
- Unitary base
Air filters come in a variety of designs, including pleated, panel, pocket, rigid box cell, and cartridge. They are selected for an application based on their MERV rating. MERV or Minimum Efficiency Reporting Value is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters. MERV is defined in ANSI/ASHRAE Standard 52.2, which presents test procedures to categorize air filter expected performance.
The MERV number is a scale from 1 and 16 and represents a worst-case performance of a filter when handling particles in the range of 0.3 to 10 microns. The higher the MERV value, the greater the percentage of particles captured.
MERV 1-4 – Particles greater than 10 microns; examples are pollen, sanding dust, textile fibers. These filters are typical for use in private residences.
MERV 5-8 – Particles from 10 to 3 microns and examples are spores, dander, and found in general commercial applications.
MERV 9-12 – 3 to 1-micron size and are typified by lead dust, some bacteria, and welding fumes and applied in manufacturing and laboratories.
MERV 13-16 – Particles from 1 to 0.3 microns, which would include all bacterial, paint pigments, smoke. These are used in hospitals and surgery suites.
MERV 17-20 – Particles less than 0.3 microns. Some viruses and fine dusts such as carbon.
We need to point out HEPA and ULPA filters, as they are essential because of their applications for critical high filtration processes. High Efficiency Particulate Air filters (HEPA), are designed to remove at least 99.97% of particles whose diameter equal or less than 0.3 microns. The next level of high filtration is the ULPA or Ultra Low Particulate Air (ULPA) filters, which are 99.9995% efficient in removing particles 0.12 micron and larger. Both filters’ designs are commonly required in pharmaceutical manufacturing, Biotech, Electronics, Aerospace, and Hospitals.
These filters are supplied with gasket or gel seals depending upon the filtration requirement. Where materials collected are hazardous or potent compounds, bag in – bag out collars are fabricated into the housings and bubble-tight isolation dampers are used to isolate the housing. When inserting or removing the sealable filter elements sealable bags are used to contain captured materials.