White Paper

Explanation of Patented Fiberlene Static Air filtration

“If you really want to know how it works”

The PRINCIPLE, under which the Patented Fiberlene “Electrostatic” Air Filter works, is static electricity generated by the “Friction” of forced air over OPPOSING media. Static Electricity is defined as a “Charge” at rest and is generally produced by friction or electrostatic induction. Benjamin Franklin discovered that Static Electricity and thunderstorm electricity were one and the same. The PROCESS, whereby charge transfers between dissimilar or opposing materials, at least one of which must have a high electrical resistivity, occurs by “Friction” of air movement called TRIBOELECTRICIFATION. The Opposing materials in a Fiberlene Filter are crimped epoxy powder coated anodized aluminum screen “catch cells” with organic polypropylene media of varying densities and consistent but progressively smaller hole sizes. Propylene, a hydrocarbon based resin injected to form POLYPROPYLENE strands woven into Weaves of “Warp & Fill” or a Honeycomb is patented by the manufacturer. Most organic and polymeric materials have volume resistivities greater than 108 ohmes per meter and retain a static charge for long periods. Polypropylene fiber buried in wet earth for six months retains a measurable static charge. The physics of TRIBOELECTRIFICATION CHARGING is not yet fully understood by science. The magnitude of “Charging” may be influenced by surface contamination, force or friction (Air Speed) and relative humidity.

ASHRAE (The American Society of Heating Refrigeration and Air Conditioning Engineers) is the governing body of the HVAC (Heating, Ventilation and Air Conditioning) industry and charged with setting “Standards” for Air Filters. These standards, knows as 52-76 (established in 1952 and revised in 1976) relate to IMPINGEMENT style filters. Filters that require a dust particle to hit or come into contact with the filter media in order to be captured are “Impingement” or Impaction style filers made of various media materials of which the most common is “Spun Glass” or Polyester. These are the oldest and most common types of filters and the 52-76 lab tests are designed to TEST these types of filters. In discussing these 52-76 standards, it is necessary to point out that 99% of all Air Contaminate Particles are SMALLER THAN ONE MICRON. A micron is 1/25,0000th of an inch and make up 99% of the total air contaminates by VOLUME. The remaining one to two percent make 99% of total air contaminates by WEIGHT. This 1% or 25 is what BLINDS or LOADS most filters. Atmospheric Dust Spot Efficiency is the 52-76 test that determines a filter’s performance on these one and sub-one size particles. Most Class II style filters range in efficiency levels of 10 to 60% and depend on the “Particle” being trapped by impacting the media. This results in a very short filter life, Increased Air Restriction and Utility costs plus Unit strain and reduced performance. The Patented Fiberlene Filter captures these one and sub-one size particles by STATIC ELECTRICITY generated by the “Friction” of forced air over OPPOSING media. This CONCEPT is addressed in a phenomenon referred to as MEDIA VELOCITY which in layman’s terms is “Retention Time”. The average size patented Fiberlene Filter has 20.19 square feet of MEDIA with opposing electrical natures. To attain the MEDIA VELOCITY of any filter, divide the air volume cfm by the total square feet of MEDIA. The Fiberlene model was tested at 1200 cfm divided by 20.19 square feet of media equaling 59.44 feet per minute. Most impingement style filters have about 6 to 8 square feed of media resulting in an approximate MEDIA VELOCITY of 150 feet per minute. Fiberlene’s DIFFUSION and slowing of the air over these “Opposing” layers of media WITHOUT excessive restriction greatly ENHANCES the static charge generation properties of TRIBOELECTRIFICATION. This static charge causes “Polarity” alteration of one and sub-one micron size particles.. (+ & -). As these CHARGED particles come into contact with the ‘Anodized Aluminum “Catch Cell” or each other in the CONDITIONED space, they ATTRACT. This agglomeration causes particles to gain in MASS and settle faster where they are delivered back to the Fiberlene Filter catch cells by the forced air stream. Setting the “FAN” system to MANUAL to increase the air “Change over” rate and CIRCULATING the air INCREASES STATIC CHARGE and allows ‘Loose” materials in old contaminated DUCT systems to break loose and eventually become trapped in the Fiberlene Filter. In essence, FORCING the filters to FILTER the air. No filter can be effective unless AIR passes through it. The utility COSTS for running a “Fan System” on Manual is about 25 cents per day and doing this for a few hours per day for several weeks will have a SELF-CLEANING effect on the DUCT system PLUS convert the HVAC unit into an AIR CLEANER for the entire facility and not just one room!

PERMANENT filters are ancient. They have always been known to work well but the “Knock” was that they are difficult to CLEAN. Fiberlene Filters were designed with this in mind and “State of the Art” best describes a unique feature called STAGE LOADING. The patented Stage Loading assumes that all dust or Air Contaminates are NOT THE SAME SIZE and LOADING in Stages is necessary to facilitate Even Loading (BALANCED FILTRATION) and CLEANING. This “state of the Art” feature would not have been as effective prior to advances in “Weaving” the polypropylene strands into CONSISTENT SIZE AND PROGRESSIVELY SMALLER hole openings afforded by the varying layers of polypropylene media layers and the “Treated” Aluminum “Catch Cell” opening. This STAGE LOADING feature, found only in the Fiberlene Filter makes CLEANING by “BACK-FLUSHING” (Opposite the Air Flow) with soap and water a simple chore. A FULL hose works because the object is to “WET” the interior “Catch Cell” to BREAK the static charge. Vacuuming Opposite the Air Flow or “Back-Flushing” with approximately 60 pounds of air pressure will extend the filter’s life for severe weather periods and keep the static charge in place. All filter applications must be addressed individually. Cleaning schedules are optimally determined by a Magnahelic gauge, which measures “Pressure Drop” by inches of water or WG – Water Gauge. Magnahelic gauges are readily available. The 1” model Fiberlene Filter should be cleaned when this gauge reaches .5” wg and the 2” model at 1” wg. The ASHRAE 52-76 standards prove a Fiberlene Filter is a very SOUND Air Filter. Independent Lab Tests show that Fiberlene has a VERY LOW INITIAL RESISTANCE and a very HIGH LOADING CAPACITY (160 grams). Since the Fiberlene LOADS 160 grams (450 Grams=1 Pound), it can last longer in most applications before it reaches the suggested Magnahelic Pressure Gauge Water Gauge.
AHSRAE has not educated the “END USER” as to the meaning and significance of these 52-76 standards and consequently, most CUSTOMERS insist upon trying or TESTING prior to making a Volume purchase. There are countless variables affecting Air Filtration, such as seasons of the year, facility activity levels, weather conditions and all contribute to Indoor Air Quality (IAQ). The 1990 INDOOR AIR QUALITY ACT became LAW IN 1992 and has been progressively strengthened. This law causes filtration to be a real concern for Maintenance Engineers and others charged with PREVENTATIVE MAINTENANCE. Fiberlene believes the HIDDEN COST OF IAQ is filter MAINTENANCE. A test of the Fiberlene Filter in any Application must be in a full A/C unit and not a MIX of Fiberlene and other filters. The real DECISION to be made is whether a facility’s Air Filters will be MAINTAINED by changing and disposal or by WASHING Permanent Filters. Changing and Disposing of “Spent” Air Filters amounts to throwing $$$$ in the LAND-FILL. Fiberlene’s ease of cleaning, low air restriction and high loading capacity translates to CLEANER AIR, UTILITY & LABOR SAVINGS, IMPROVED UNIT PERFORMANCE AND EXTENSION OF UNIT LIFE. Fiberlene’s Patented STAGE LOADING solves a PERMANENT AIR FILTRATION PROBLEM WITH A TRULY PERMANENT SOULUTION!

IN SUMMARY: The merits of Static Electricity in air filtration are not fully understood by science or addressed by Current 52-76 ASHRAE standards. MEDIA VELOCITY has the effect of “SLOWING” the air through diffusion to ENHANCE the static charge generation properties of the “Opposing” filter media similar to “Retention Time” required in liquid filtration. Patented STAGE LOADING (Progressively Smaller Openings) is accomplished by using “State of the Art” materials which contribute to a greater LOADING CAPACITY and EASE OF CLEANING. Maintenance is the HIDDEN COST OF INDOOR AIR QUALITY (IAQ) and maintaining filters through changing and disposal or washing (Back-Flushing opposite the airflow) and reuse is the primary question to be answered in maintaining IAQ. INDOOR AIR QUALITY IS IMPOSSIBLE TO PROVE WITHOUT A DOCUMENTED PREVENTATIVE FILTER MAINTENANCE SCHEDULE!

UTILITY COSTS OF RUNNING A 24” x 24” x 1” OR 2” FOR 720 HOURS OR ONE MONTH (30 DAYS). These numbers assume a 65% Fan Efficiency and an Electricity Cost of 10 cents per KW.

.10 $ 2.59  
.20 $ 5.19 The 1” Model is TESTED at 1200 cfm with an initial
.30 $ 7.79 Resistance of .16 wg and a Face Velocity of 300 feet
.40 $10.39 per Minute and 20.19 square feet of Media resulting in a
.45 $11.69 59.44 feet per minute MEDIA VELOCITY.
.50 $12.99 (1200 + 20.19 = 59.44)
.55 $14.28 The 2” model is tested at 1500 cfm and an Initial Resistance
.60 $15.58 of .17 Wg with a Face Velocity of 375 feet per minute.
.75 $19.49 Media Area is 27.18 square feet resulting in a MEDIA
1.00 $25.98 VELOCITY of 55.19 feet per minute.