Nonwoven Air Filter

Product Overview

A non-woven air filter is a fleece-like filter medium made of Polyester synthetic fiber. It is most often used as the first-stage (pre-) filter in air handling units, outdoor air intakes and equipment fans, stopping larger dust, lint and hair to protect the medium-efficiency and HEPA filters downstream. Thicknesses 3 / 5 / 10 / 15 / 20 / 25 mm, supplied in rolls (usually 1.2 m wide, 20–50 m long) or cut to size; basis weight and pressure drop provided per selection.

Key Specifications

Filtration Efficiency: Gravimetric efficiency above 65%
Filter Media: Polyester, nylon and acetate fibers formed into a multi-directional needle-punched web; fibers are fully bonded at every crossing point for high dust collection
Custom Sizes: Supplied cut to size or in full rolls. Roll widths from 1 m to 2 m; roll length varies slightly with media thickness
Test Standard: ASHRAE 52.1-1992

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Specifications

Filter Media: Polyester, nylon and acetate fibers formed into a multi-directional needle-punched web; fibers are fully bonded at every crossing point for high dust collection
Test Standard: ASHRAE 52.1-1992
Filtration Efficiency: Gravimetric efficiency above 65%
Custom Sizes: Supplied cut to size or in full rolls. Roll widths from 1 m to 2 m; roll length varies slightly with media thickness

Model Reference

Model	Description	Size
PF10-595-595	Non-woven filter 595X595X10mm	595 × 595 × 10 mm
PF25-595-595	Non-woven filter 595X595X25mm	595 × 595 × 25 mm
PF3-595-595	Non-woven filter 595X595X3mm	595 × 595 × 3 mm
PF5-595-595	Non-woven filter 595X595X5mm	595 × 595 × 5 mm
PF5-610-610	Non-woven filter 610X610X5mm	610 × 610 × 5 mm
PF25-610-610	Non-woven filter 610X610X25mm	610 × 610 × 25 mm
PF10-592-592	Non-woven filter 592X592X10mm	592 × 592 × 10 mm
PF15-495-495	Non-woven filter 495X495X15mm	495 × 495 × 15 mm

Common sizes are listed above. Other sizes, frame materials and efficiency grades can be made to order — please quote the model or size when requesting a quotation.

Detailed Description

A non-woven air filter is a fleece-like filter medium made of Polyester synthetic fiber. It is most often used as the first-stage filter (pre-filter), placed in air handling units, at outdoor air intakes and in front of equipment fans to stop larger dust, lint and hair, so the medium-efficiency and HEPA filters behind it do not clog too quickly. It comes in six thicknesses — 3, 5, 10, 15, 20 and 25 mm — and you can buy whole rolls to cut yourself, or have us cut pieces to size.

Rolls or cut pieces?

If you use a lot, need many sizes and have someone on site who can cut, whole rolls are the most economical; if the size is fixed and you just want to drop the filter in, order cut pieces. Roll length depends on thickness: the thicker the medium, the shorter the roll.

Thickness	Standard roll (width × length)	Area per roll
3 mm	1.2 m × 50 m	60 m²
5 mm	1.2 m × 50 m / 30 m	60 m² / 36 m²
10 mm	1.2 m × 50 m / 30 m	60 m² / 36 m²
15 mm	1.2 m × 50 m / 30 m / 20 m	60 m² / 36 m² / 24 m²
20 mm	1.2 m × 30 m / 20 m	36 m² / 24 m²
25 mm	1.2 m × 30 m / 20 m; 1.4 m × 20 m	36 m² / 24 m²; 28 m²

The most common width is 1.2 m; 1.22 m, 1.4 m and other widths are also available on request.

How to choose the thickness

A thicker fleece has more fiber, so it holds more dust, but air also passes through it less easily. In the orders we actually supply, pre-filter pieces for air handling units are most often 5 mm or 10 mm, with some at 20 mm; when replacing, ordering the same thickness as the old piece is the safest choice. Examples from actual orders: - Pre-filter pieces for air handling units: 700×700×5 mm, 550×550×5 mm - Thicker pre-filter pieces: 630×630×20 mm - Large air intakes: 1200×1800×10 mm, 1200×1100×10 mm - Small pieces for equipment fan intakes: 125×70×10 mm

Specifications

Material	Polyester	Polyester	Polyester	Polyester	Polyester	Polyester
Thickness	3mm	5mm	10mm	15mm	20mm	25mm
Roll size	1.2Mx50M	1.2Mx50M	1.2Mx30M	1.2Mx20M	1.2Mx20M	1.2Mx20M

Basis weight and pressure drop: see the industry typical values below; the specification of the batch is attached to the quotation.

Industry typical values (from public data)

We do not have a specification sheet from our roll supplier, so the table below summarizes typical ranges from overseas manufacturers' catalogs and public specification sheets; the shipping specification governs. The faster the air, the higher the pressure drop of the same fleece, so each pressure drop is given with its test velocity.

Thickness	Basis weight (approx.)	Initial pressure drop (approx.)	Approx. class (EN 779)
3 mm	Provided per selection	Provided per selection	G2 or below
5 mm	80–120 g/m²	10–20 Pa @1.5 m/s (estimated)	G2
10 mm	100–150 g/m²	15–30 Pa @1.5 m/s	G2–G3
15 mm	130–180 g/m²	20–35 Pa @1.5 m/s	G3
20 mm	180–250 g/m²	30–45 Pa @1.0–1.5 m/s	G3–G4
25 mm	220–400 g/m²	35–50 Pa @1.0 m/s	G4

Replacement is generally recommended when pressure drop reaches about 150–250 Pa; polyester fleece is for ambient-temperature use, with a maximum service temperature of about 70–100°C stated in catalogs. ※ Pieces can be cut to customer requirements; rolls can be made to custom sizes.

Frequently Asked Questions

What information do you need to order cut pieces?

Please give length × width (mm), thickness and quantity, plus color, whether you want heat-sealed edges (edges pressed shut with heat so they shed less), and the acceptable size tolerance. We have cut pieces from 125×70×10 mm for equipment fans up to large 1200×1800×10 mm sheets. For whole rolls, tell us the thickness, width and length.

Is it heat resistant? Can it be used in an oven or hot exhaust?

Polyester fleece is an ambient-temperature material; public catalogs give a maximum service temperature of about 70–100°C, so it is not recommended for ovens or hot exhaust. For high temperatures, use a heat-resistant fleece made of aromatic polyamide fiber, available in 180°C and 240°C versions — please tell us the actual temperature when you ask for a quote.

Do you have flame-retardant or UL 94 rated non-woven?

The standard grade is not a flame-retardant material and has no UL 94 test report. If your specification requires flame retardancy or UL 94, please send the specification with your inquiry and we will check whether a suitable material and report can be provided.