Precisionaire 425T Panel manual PlyPolyester Panel Filter, For use as a pre-filter

425T Panel

4-Ply Polyester Panel Filter

For use as a pre-filter

The 425T panels are manufactured from two distinct 100% resin bonded polyester media layers with a wire support frame sealed between the two layers. This provides a self-supportive, self-sealing panel filter which significantly decreases air bypass when installed in the entire fil- ter track.

The first layer is a 1.5” polyester media which uses 45 denier polyester fibers with an open weave on the entry side, 15 denier fibers with slightly tighter weave in the middle, and 6 denier fibers with an even tighter weave on the downstream side. This triple denier entry media com-

bination provides three stages of filtration against particulate. The downstream side of the media is treated with a special non-migrating tackifier which significantly increases the filter’s efficiency. The second media layer is made from 6 denier polyester fibers heavily needled to a dense 1/4” depth. This adds a final layer of defense against small particulate.

The progressive density media structure is what makes the 325T panel so effective. The particles are “funneled” out of the airstream. Large particles are captured on the outer layer and finer particles are captured in the second and third layers.

425T panel filters are available as single panels with one single wire sup- port covering the entire filter area, or link panels utilizing multiple wire sup- port pieces inside a single piece of media. Both the single panels and the link panels are available in custom sizes.

Fractional Efficiency vs. Particle Diameter

	100
%	80
Efficiency	60
Fractional	40
	20
	0
	0	1	10

Particle Diameter (∝m)

Test Type	Fractional Efficiency
Test Number	T033103B
Flow Rate/Velocity	1968 cfm
Test Aerosol:	KCI Neutralized
DP (”H20)	0.489
Size	24x24 panel
	Initial
Size	Fractional
Range (mm)	Efficiency (%)
0.3-0.4	2.3
0.4-0.55	9.6
0.55-0.7	19.7
0.7-1.0	34.0
1.0-1.3	46.9
1.3-1.6	53.4
1.6-2.2	60.3
2.2-3.0	68.5
3.0-4.0	77.0
4.0-5.5	82.3
5.5-7.0	86.0
7.0-10.0	90.1

110