Andreae filters are composed of two folded, solid cardboards pieces which are glued to each other in bends. Openings on the front side are located asymmetrically against the openings in the rear wall. When the air goes through the filter, the airflow is changed in all axes.

In the rear wall, created by deeper bends in the V-shape, pockets are created to capture separated liquid particles.

Principle

The air flow saturated with liquid particles, e.g. paints, is accelerated in the flow through the filter and multiply changes its direction. Particles heavier than air are separated from this stream by inertia. The air escapes through the outlet openings of the filter, while particles of paint are accumulated in the capturing chambers.

Use

By using inertia, Andreae filters capture very efficiently aerosol cloud, which is created by the spraying of all types of liquid paints and lacquers, binding agents, adhesives, epoxide resins, solvents, asphalt, gels, tar, Teflon, polyurethane, vinyl, oils, grease, glaze, etc. Generally said, filters can be used everywhere where it is necessary to remove liquid particles from blowing foggy air. Andreae filters can be used independently or as a prefilter in multi-level filtration systems.

Advantages

• Accumulation of paint outside the airflow slows down the increase in differences in pressures and air velocity. Lifespan of Andreae filters is 3-5 times longer than that of flat, fleece filters.
• Filters show high stability in the air stream. The front V-shape wall prevents the reflection of overspray. The employee remains in a clean environment and the air stream around the sprayed objects is stable.
• The folded structure of filters is very strong, it resists suction of ventilation and does not collapse even when it is relatively full.
• Filters with easy and quick exchange. They reduce operating costs for maintenance of spray booths.

Filter Andreae Original

Basic filter, used as a prefilter in multi-level filtration systems, where it captures the largest part of liquid particles of paint and protects the following level of filtration (usually an expensive synthetic filter) from early clogging. In the capture chambers of the Andreae Original filter, there is up to 5 times more paint captured than in standard fleece filters. The filter is equipped with a strap which prevents it from excessive stretching.

Delivery: size10 m2 x width 50, 75, 90 or 100 cm

Filter Andreae HC

In the type Andreae HC, there is a paper strip on the front side which partially overlaps the inlet holes. The effect is multiple: even capturing of paint overspray, reduction of pressure losses when filling the filters, capturing the oversprayed paint on the surface of the paper strip, higher holding capacity up to 10 – 40 %.

Delivery: size 8 m2 x width 50, 75, 90 or 100 cm

Filter Andreae HE

This type of Andreae filter connects the advantages of an Andreae filter and a filter from synthetic fibres and thus it is regarded as two filters in one. The HE type has a layer of synthetic filter on the outlet side. In place of two filters enrolled in a row, two frames, double labour costs when swapping the filters and a larger inventory, it is possible to solve all this with Andreae HE filters.

Delivery: size 8 m2 x width 75, 90 and 100 cm

Filter Andreae HP

Combines the advantages of HC (High Holding Capacity) type and HE (high efficiency) filter type. The filter has a paper strip glued on the front side and on the back a synthetic filter material. Andreae HP filter achieves very good results in the separation of overspray of paints at low costs of maintenance of spray booth.

Delivery: size 8 m2 x width 75, 90 or 100 cm

Andreae Starter

Andreae Starter composed of two layers of sulphate cardboard. Layers are perforated, folded and glued together.

Holding capacity: up to 18 kg/m2*

Filtration efficiency: up to 98.1 %*

Optimum conditions of use:

• Recommended air velocity: 0.25 - 1 m/s
• Pressure loss: 0.25 m/s - 8 Pa, 0.5 m/s - 20 Pa, 0.75 m/s - 30 Pa, 1 m/s - 40 Pa
• Maximum recommended pressure loss: 128 Pa - 256 Pa

Delivery: size 10 m2 x 100 or 75 cm