You have questions? You are not the only one.
Read the FAQ for more information on our products.


Separation by inertia is the working principle of the Andreae Filter.  Airborne paint particles (overspray) enter the Andreae Filter to undergo several radical directional changes and settle out of the airflow to accumulate in the holding pockets. The holding pockets retain the paint particles outside of the air stream.

Andreae Filters are made to capture any wet solid or liquid particles contained in an air stream: high solid enamels, baked and air dried enamels, glues, oils, stains, lacquers, fiberglass, epoxies, asphalts, clear coats, tar, teflon, etc.

Our filters are produced in our 3 manufacturing sites:

-Montréal, Canada

-Szczecin, Poland

-Hô Chi Minh City, Vietnam

You can buy our range of Andreae Filters by contacting one of our representatives located in your region or fill out our form.  

We deliver our products all over the world.

Minimum purchase quantity is 1/2 or 1 pallet.

Yes, we need 60 filters per pallet but with any type mix you require.

We put 60 filters (boxes) per pallet.

If your package is delivered damaged, please contact your sales representative to find the best possible solution (credit note or replacement).

Take a look at our article available on the Aerem blog to know how to dispose of your filters.

Of course. We invite new companies to join our growing international distributor network. We wish to promote our solutions in the existing and new markets. 

Click here to fill out the form. 


Not necessarily. It is more the quality of the paper. On the other hand the W shape structure of the Andreae filters is the most important element which will guarantee its structural rigidity.

Yes every paper used in the Andreae Filters manufacturing have a special humidity resistance treatment.

The tested clean Andreae filter sample is weighed then inserted in a test duck. A clean absolute filter is weighed and inserted in the duck down stream of the Andreae filter. The air velocity is tuned by a fan at the end of the tunnel. A spray gun upstream of the Andreae filter provides the overspray. When airflow resistance reaches 0,5 inch (12,5mm) of water column at 150 ft/min both loaded filters are removed and weighed again. The weight distribution ratio between both filters will determine the filtration efficiency and the holding capacity at a given airflow resistance.

The Andreae Original is a single stage filter with 98.2% paint arrestance efficiency. The Original has a holding capacity of 4lbs/sf (1,8kg).  The Andreae High Efficiency (HE) is a two-stage filter with 99.4% paint arrestance efficiency. The HE has a holding capacity of 5.3lbs/sf (2,27kg). To decide which filter is best for your application, first consider the number of stages and efficiency required to filter the coatings applied. Second, consider the type of paint used. Fast drying paints such as air-dry enamels are best filtered through the HE, slow drying paints such as high solids enamel are best filtered through the Original. Also consider tackiness of the coating such as in stains and adhesives which are best filtered through the Original.

As soon as the airflow in the spray booth slows down to the minimum required by your installation.

The size of the exhaust area of your spray booth will indicate the necessary size of the filters.

The Andreae Filter will need a channel frame. Renvoi sur le lien. Measure the width and length inside the frame to determine actual filter size. Exhaust walls with 20×20″ and 20×25″ cells require a one-time installation of the Andreae Wire Support (provided free of charge for all qualifying conversions).

Contact your distributor to make the change or a Aerem representative for a distributor near you.

The accordion shape of an Andreae Filter concentrates a large number of pockets and holes per square foot. Overstretching an Andreae Filter dramatically increases the static pressure and reduces filter life. Ideal installation is 8 pleats per foot or 26 pleats per linear meter. Most Andreae Filters are equipped with an extension limiter to prevent over-extension.

As the filtration area directly behind the painted object is more exposed to overspray than the peripheral area, airflow resistance will climb faster than in the peripheral area. Airflow becomes uneven resulting in different air velocities across the booth exhaust area which evolve inconsistently thru time. One response is to use pad filters. The pads directly behind the painted object can be changed more often than the peripheral ones. An other response is to use Andreae Filters which do not face load due to their structure and inertia separation working principle which results in a slow airflow resistance build up.

It is not our recommendation. Typically, prefilters are used to increase the life of the filter behind them. Andreae Filters already last 3-5x longer than other media such as fiberglass. If the purpose of adding a prefilter is to increase efficiency, use an Andreae Original as prefilter backed with a high efficiency more expensive polyester filter.


Take a look to our article available on the Aerem blog.

Understand that when you convert a water wash booth to a dry filter booth, you are simply removing the water baffles, leaving behind an opening in the existing frame in which you will install a channel frame (usually in front of the existing exhaust wall chamber). Therefore, air flow changes should not be significant if the fan was sized correctly; however, it is possible that the fan may need to be slowed down due to the lower airflow resistance of a dry over spray collector filter.

Yes, Andreae Filters can be used in any type of dry filter exhaust wall. The filter frame must be compatible with the Andreae Filter and may require minor modifications. See our installation instructions for additional information.

Typically, fans unload (or lose the ability to move air) because the filter is overloaded or the fan has a problem.  First, ensure the Andreae Filter is installed at 8 pleats per linear foot.  Next, install a pressure gauge to measure airflow across the clean filters and mark the point just before losing airflow to indicate when the filters need to be changed. Choose a fan that is capable of pulling up to 1 inch WC across the filter.  Our recommended maximum pressure drop is 0.5 inch (12,5mm) WC because some older fans will unload above this pressure.  However, the Andreae Filter is capable of handling pressure up to 1 inch (25,4 mm) WC.  If your fan is sized to handle greater pressure, we  recommend to not change the filter at 0.5 inch (12,5mm) WC but to continue operating the booth as long as the air velocity does not decrease, this to get the maximum life out of the filters.  Ensure the fan motor, belt, blades, etc. are maintained properly.  Clean the fan periodically to remove particle build up.

Over time, particles will build up in the plenum. Regardless of filter media, the plenum should be cleaned periodically since exhaust filters are never 100% efficient. For example, if 100 gallons (378 liters) of coating is sprayed into a 98% efficient filter, 2 gallons (8 liters) will escape. Prevent excessive build up in the plenum by maintaining your filters properly: install the filters as per manufacturer instructions and monitor static pressure drop across the filters to ensure they are not overloading. A general rule of thumb is to clean the plenum annually or more frequently in high use booths.

The migration phenomenon is common when slow-drying coatings are used with mesh filters. The airflow will eventually pull particles trapped in the mesh back into the air stream. Consequently, the particles already deposited will again be airborne and migrate through the system. To prevent this from happening, change to an Andreae Filter where the paint particles are trapped in holding pockets outside of the air stream.

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