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General Air Filter Information
Flanders Pre Pleat 40 extended surface pleated air filters are
designed to operate in most every type of installation. Available
in 1 inch, 2 inch, and 4 inch nominal thickness, these filters have
an average atmospheric dust spot efficiency range of 25-30% per
ASHRAE Standard 52.1 test methods. Pre Pleat 40 filters offer greater
efficiency and service life than disposable filters, pad and frame
systems, or metal washable filters. The overall design of the product
makes these air filters the accepted choice in applications requiring
high performance and extended service.
These air filters are suitable for variable air volume systems.
Operating face velocity ranges are from 0 to 500 fpm for 1 inch
and 2 inch filters, and from 0 to 625 fpm for 4 inch filters. Standard
and High Capacity designs are offered.
Pre Pleat 40 air filters are UL 900 Class 2 listed but are available
with UL Class 1 listing.
Versatility
Most heating, air conditioning, or ventilating systems can be upgraded
with the use of Pre Pleat 40 filters in place of existing flat panel
types.
The inherent strength of the air filter allows for easy change
out as it will not collapse, warp, or bend in normal service.
Pre Pleat 40 air filters are available in a wide range of sizes
and will fit most commercial and industrial installations with little
or no system modification. Fasteners are available to adapt the
filter to existing filter banks.
Installation Considerations
Pre Pleat 40 pleated air filters are suitable as primary filters
and can be installed in Type 9 Holding Frames, K-Trac Framing Modules,
Surepleat Side Access Housing and similar existing hardware. They
may be used as prefilters for Precision Pak, PrecisionCell and Rigid-Air
filters in these framing systems and in Sureseal Side Access Housings.
Air Filter Physical Data
Media: High-loft, non-woven cotton/synthetic blend
Media Support: Diamond-shaped expanded metal
Pleat Design: V Pleat
Frame: Moisture-resistant carrier board
Important Features
Media maximizing v-pleat design
Expanded metal grid prevents media flutter while in operation
Diagonal and horizontal support members provide frame strength
Filter media pack is sealed to eliminate air bypass
Average ASHRAE efficiency is 25-30%
Average arrestance is 90-92%
Air Filter Construction
Air filter frames are constructed from two pieces of diecut,
moisture-resistant carrier board. Components "telescope"
into one another to provide double-wall construction and a precision
fit. The frame includes diagonal and horizontal support members
bonded to the media on the air entering and leaving sides for
unsurpassed frame strength. Locking corners and positive media-to-frame
seal reduces the possibility of air bypass.
The filter media is a high-loft, reinforced, non-woven cotton/synthetic
blend. It is continuously laminated to an expanded metal grid
on the air leaving side to provide pleat stability throughout
the life of the air filters and prevent media flutter while in
operation.
The Flanders unique v-pleat wedge pleat allows for total media
usage and provides maximum air flow and dust holding capacity.
Principles of Operation
The Flanders v-pleat design insures that the greatest media area
is exposed to the air flow to promote uniform dust loading. Competitive
air filters cannot maintain this rigid shape and tend to flatten
out, using only a portion of the media. This v-pleat design creates
an air exit area equal to the air entering area, which minimizes
end losses and reduces pressure drop. Radial wedge pleats have
unequal air exit and air entering areas, which cause higher resistance
and uneven use of media.
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