HEPA filters can remove at least 99.97% of 0.3-micrometer particles, and are usually more effective for particles which are larger or slightly smaller. They are effective down to 0.01 micrometers in many cases, but become very ineffective for particles smaller than 0.01 micrometer. HEPA filter all the air going into a clean room must be arranged so that no air bypasses the HEPA filter. In dusty environments, a HEPA filter may follow an easily cleaned conventional filter (pre-filter) which removes coarser impurities so that the HEPA filter does not need to be changed or cleaned frequently. HEPA filters do not generate ozone or other harmful byproducts
HEPA filters are composed of a mat of randomly arranged fibres. Key metrics affecting function are fibre density and diameter, and filter thickness. The air space between HEPA filter fibres is much greater than 0.3 μm. HEPA filters are designed to target much smaller pollutants and particles are mainly trapped (they stick to a fibre) by one of the following three mechanisms:
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Interception, where particles following a line of flow in the air stream come within one radius of a fibre and adhere to it.
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Impaction, where larger particles are unable to avoid fibres by following the curving contours of the air stream and are forced to embed in one of them directly; this increases with diminishing fibre separation and higher air flow velocity.
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Diffusion, an enhancing mechanism is a result of the collision with gas molecules by the smallest particles, especially those below 0.1 µm in diameter, which are thereby impeded and delayed in their path through the filter; this behavior is similar to Brownian motion and raises the probability that a particle will be stopped by either of the two mechanisms above; it becomes dominant at lower air flow velocities.
Diffusion predominates below the 0.1 μm diameter particle size. Impaction and interception predominate above 0.4 μm. In between, near the 0.3 μm MPPS, diffusion and interception predominate.
The initial filter air flow resistance and final filter air flow resistance are typically measured as pressure drop across the filters.
4"CARDBOARD FRAME ECONOMY
MINI PLEAT AIR FILTERS
This filters designed for applications requiring higher efficiency with a standard or smaller space. By using premium cardboard framing. they fit in the same frame space as a 4"pleated filter without sacrificing high efficient performance. Can be used as either a per-filter or final filter for most HVAC applications depending on your filtering system design.
 High efficient pleating in a compact space-saving design
4"deep die-cut paperboard frame.1"and2" thickness are also a available
Use in commercial, medical, communication or industrial applications
Filter
Efficiency(%) |
|
|
Capacity
CFM |
Initial
Resistance
(ln.) |
Recommended
Final Resistance(ln.) |
Carton
Quantity |
90-95
90-95
90-95
80-85
80-85
80-85
60-65
60-65
60-65 |
12
20
24
12
20
24
12
20
24 |
24
20
24
24
20
24
24
20
24 |
|
|
11 3/8
19 3/8
23 3/8
11 3/8
19 3/8
23 3/8
11 3/8
19 3/8
23 3/8
|
11 3/8
19 3/8
23 3/8
11 3/8
19 3/8
23 3/8
11 3/8
19 3/8
23 3/8 |
3 5/8
3 5/8
3 5/8
3 5/8
3 5/8
3 5/8
3 5/8
3 5/8
3 5/8 |
|
1000
1400
2000
1000
1400
2000
2000
1400
2000 |
0.68
0.68
0.68
0.59
0.59
0.59
0.40
0.40
0.40 |
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50 |
2
2
2
2
2
2
2
2
2 |
4"SLIM LINE MINI-PLEAT AIR FILTERS
Remove most airborne contamination such as dust, smoke, soot, pollen and bacteria. Versatile enough for all HVAC filter applications and will fit in all commonly used 4 " filter frames and housings. Galvanized steel frame results in better corrosion and mold resistant. Available in ASHRAE Med to High (between 80% and 95%) efficiencies. Can be used as either a per-filter or final filter depending on your filtering system design. Meets high efficiency requirement and offers extra filter integrity and consistent performance
High efficiency and energy saving
Compact 4" DEPTH
Rugged galvanized steel frame
Excellent substitution of bag and box style filters
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