After years of viewing, sampling and testing various filters on the market, WD Services, Inc. is confident you will like our filter line-up. We consistently evaluate pricing, filter style, media, performance specifications and how each filter will affect your equipment’s performance.
Filter Delineators
Efficiency
What is the percentage that each filter captures in overspray? Depending on the filter media and where the filters are being placed, some filters can range from a low end of 40-60%, mid-range of 70-85% while a few can capture as much as 99.9%. The efficiency also relates to what particle size is captured, but is rarely shown in test results.
Particle Size
Overspray particles range from 4 – 300 micron in size. You need a filter that can capture everything. If the filter is not a good quality product, the result is either premature clogging or dirt getting through the filters. Particles then go into the pit, onto the fan blades that eventually will cause premature damage to your fan motor and bearings. Poor quality filters can cause dirt to get onto your spray job causing redo spray jobs losing you profits.
Pounds Captured
How many pounds of overspray will your filter capture before having to be changed? Some lesser quality filters capture just over 1 pound / square foot (SQFT) while some can capture as much as 6 lbs / SQFT. Look for this information on your filters EPA Efficiency reports.
Air Flow Resistance
What is the airflow resistance of the filters I use? The denser the filter, the more airflow resistance is created. Multi-layered filters can give you better airflow resistance and efficiency than single layered denser filters. Don’t be fooled by a less expensive filter, It may cost you more money by having to change your filters more frequently.
Longevity
Put all the above variables together and you have the longevity of a filter’s life. Some filters can last longer because of how they are engineered, manufactured and their material used.
Cost
Not all filters are as expensive as they seem. If you pay 20 – 50% more for a filter that lasts 2- 3 times as long as the lesser expensive filter, you may save money in the long run.
Selection of Filters
To select the best filters for you, our filtration staff will discuss with you the style and make of your equipment, type of paint you are using and the airflow capabilities of the equipment. Our goal is not only to sell you filters but also to make sure that you feel comfortable you received the best filters for your equipment. Let us send you a quote for your spray booth equipment that will include our “Good, Better and Best Filters” available for your equipment.
When Do I Need To Change The Exhaust Filters?
Each spray booth is required to have a pressure gauge (manometer or magnehelic) that measures static differences between the two sides of the filters. Every exhaust filter manufacturer’s data sheet will have listed the starting point (0.02-0.06 WG) and the ending point (0.04-1.0 WG). Every exhaust system will evacuate airflow differently due to the motors HP, blade style and exhaust stack size. You want to choose a filter that has the greatest difference between the starting and ending point of air flow resistance. A good rule of thumb is to change the filter prior to the listed end point to prevent dried overspray from staying in the booth and falling down onto your spray job.
