Filtration is an important part of a vacuum cleaner system. Indeed, it ensures that what is inside the recovery tank remains within, keeping the environment and surrounding air free from contaminants. Alternatively, it can ensure that the recovered material are free from contaminants, to allow recuperation for re-use.
Filters can be installed upstream or downstream, alone or as a part of a multiple-stage filtration system. Systems can be installed to ensure the filter maintenance, thus improving its performance and longevity. This page features basics on filtration, filtration systems and filtration components.
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A HEPA filter is a type of air filter, which means it filters the air coming in or out of the vacuum cleaner system. It can remove at least 99.97% of dust, pollen, mould, bacteria and any other airborn particles with a size of 0.3 microns or larger.
Tested: IEST RP-CC001.3. H14 by MPPS method as per EN 1822 and OSHA compliant.
A ULPA filter is a type of air filter. It can remove at least 99.999% of dust, pollen, mould, bacteria and any other airborn particles with a size of 0.12 microns or larger.
Tested: IEST RP-CC001.3. U15 by MPPS method as per EN 1822 and OSHA compliant.
A Nuclear Grade HEPA filter is a type B filter constructed and tested in accordance with ASME AG-1, IEST RP-CC001.3. and MIL-STD-282. These filters are OSHA compliant.The minimum filter efficiency of an encapsulated filter of this type is 99.97% on 0.3 micron sized particles or larger.
The Coalescing filter element is used for the removal of solid particles, water and oil aerosols.
Activated carbon is used for the adsorption of toxic/nuisance fumes and vapors. Tiger-Vac offers a variety of activated carbons for the recovery of fuels, mercury, chloride and acid vapors and for Arsine and Phosphine.
HEPA Filters - efficiency of 99.995% on 0.3 microns - Tested IEST RP-CC001.3 - H14 as per MPPS method EN 1822.
ULPA Filters - efficiency of 99.999% on 0.3 microns - Filtration efficiency of 99.9995% on 0.18 microns - Tested IEST RP-CC001.3 - U15 as per MPPS method EN 1822
Please be advised that all Tiger-Vac HEPA/ULPA Filters are Aerosol tested when assembled, either upstream or downstream, inside of the vacuum cleaners.
All Tiger-Vac HEPA/ULPA Filters are assembled mechanically with 3 bolts and include a specially designed memory gasket in order to prevent any leaks during the life span of the gasket thus insuring the health and safety of the end user.
How filtration is achieved
This is an example of how a combination of ULPA, HEPA and other types of filters can ensure the trapping of contaminants. There are many other types of configuration, depending on the vacuum cleaner system. This system is a 5 stage filtration system.
- Paper Filter Bag with liner (one micron efficiency) collects the bulk of recovered materials and keeps the other filters clean.
- Dralon filter with smooth surface prevents caking of fine dust.
- Polyester filter (one micron efficiency) prolongs the life of the ULPA filter.
- ULPA filter. Large enough to handle the amount of airflow that the vacuum produces without any significant pressure drop.
- (Optional 5th Stage) Internal HEPA filter can be incorporated in the filtration system for a total of 5 stages. The filter is installed before the motor and is used when recovering toxic or nuisance dusts. It protects the motor from contamination and it allows the motor to be serviced without danger to the operator.
Manual Filter Maintenance
- The filter shaker system consists of a spring action mechanism operating directly onto the filter cage located inside of the filter chamber. The system is operated by pressing on the ergonomic handle located on the side or top of the filter chamber.
- The Manual Filter Shaker dislodges the accumulated caked-on dust from the filter thus improving the filter’s performance.
- The filter, along with the filter cage, can be easily removed from the filter chamber and washed with lukewarm water and mild detergents.
(illustration shows a top-mounted shaker)
The Manual Reverse Purge (MRP) allows for the cleaning of caked-on powder off of the filter thus maximizing performance. The filter cleaning is achieved by having the air intake reversed through the filter thus purging the clogged filter.
The Manual Reverse Purge (MRP) works by :
1 - Closing the slider on the opening to block the suction intake orifice for approximately 5 seconds while the vacuum is running.
2 - Then quickly open Purge Valve. Air is now flowing via the valve through to the filter.
Keep Purge Valve open for 1-2 seconds then close (repeat above steps 2 or 3 times).
Reverse Purge System will cause dust to fall off of the filter.
Automatic Filter Maintenance
The Automatic Reverse Purge System requires a small 2 HP compressor on a 1/4" air line hose @ 5 bar (80 psi), 3.78 l/s (8 cfm) to feed the system. This system is ideal when the vacuum cleaner will be attached to a processing system and the operator does not have the time to continually perform a manual purge. A flap has been installed inside of the suction port and will close automatically when the vacuum cleaner is turned off, thus eliminating the risk that any powders or debris will escape from the unit when operating the ARP without any suction power.
- Automatic filter cleaning system that helps remove caked-on dust from the filter.
- Pulsed air is blown from the inside towards the outside of the filter at a regular frequence.
- User can adjust the interval between the two cleaning cycles.
- Pneumatically (air) operated.
- A Filter Shaker system for hazardous locations consisting of a double acting air cylinder operating directly onto the stainless steel filter cage located inside of the filter chamber. The system is operated by filtered, oil-free compressed air. The frequency of the shaking cycle is controlled by pneumatic (air) operated timers located outside of the filter chamber.
- Short strokes are applied to the filter cage freeing the accumulated caked on dust from the Static dissipating and conductive polyester flourocarbon treated filter and allowing them to flow out, thus ensuring continuous duty and minimizing friction loss filter performance.
- The Static dissipating and conductive polyester flourocarbon treated filter, along with the stainless steel filter cage, can be easily removed from the filter chamber and washed with lukewarm water and mild detergents.
- A full immersion system for hazardous locations, consisting of a round header tank with fully integrated diaphragm valves, is built inside of the filter chamber. The system operates with filtered, oil-free compressed air. The diaphragm valves are opened in sequence by a solenoid valve controlled by pneumatic (air) operated timers located outside of the filter chamber.
- A short pulse of compressed air is injected into the top of theStatic dissipating and conductive PTFE laminated filter catridges creating a stronger airflow downward moving pressure wave. This wave breaks up the accumulated dust that is caked onto the cartridges.
- The pneumatically (air) operated controls, located outside of the filter chamber, allow only one cartridge to be cleaned at any give time, thus ensuring that the vacuum cleaner operates continuously.
- A short pulse of compressed air is injected into the top of the filter cartridges creating a stronger wave of airflow pressure which moves downward into the filters and breaks up the accumulated dust that is caked onto the cartridges.
- The electrically operated controls, located outside of the filter chamber, allow only one cartridge to be cleaned at any give time, thus ensuring that the vacuum cleaner operates continuously.