For over five years, our 35A Series Filters have been built specifically as upgrade replacements for the balloon bags used on hobby-type dust collectors. With thousands of units shipped, we have developed a wealth of experience upgrading these systems.
Upon startup with a pleated cartridge filter, the first thing you will notice is a huge increase in airflow, as compared to the original bag arrangement. This is due to the large surface area of the cartridge filter. Remember, doubling the surface area of a filter results in a four-fold decrease in pressure. Stock bags offer about 35 sq. ft. of area, so a 100 sq. ft. to 274 sq. ft. cartridge makes a big difference.
In addition to the increased flow, the filtration efficiency of your system is also improved. This is partially due to the increase in surface area, but is mainly due to the improved performance of the filter media. Our standard 35A274BLOL filter is rated 99.99% efficient at 0.5 microns after an initial break-in period.
Note that there are several different basic styles of dust collector being manufactured out there. They all look pretty much the same, but there are subtle difference in the diameter of the rim, and the size and shape of the orifice plate (separation ring, cone). We are slowly accumulating a database of the different variations, and have listed our notes on a separate page.
All of our filters are pretty evenly matched regarding air flow and pressure drop. Factors to consider are: how much wood you process, is most of it fibrous such as MDF or plywoods, is much of your dust sanding dust, do you work with toxic woods, and are you or others in the area sensitive to fine dust.
Our 80/20 Blend filters have a MERV10 (out of the box) rating, but this jumps to 99.99% at 0.5 microns after an initial break-in period. Using compressed air to clean them down (no more than 60 psi), they clean down quite nicely. They last for many years and they are the least expensive filter in our line-up. A good choice for non-commercial wood working.
Our synthetic Spun Bond filters have a MERV 11 (out of the box) rating which also improves with usage. The pleat spacing of these filters is intentionally more open than the other which offers a faster dust release as they can be cleaned with up to 100 psi of compressed air. These should be considered for heavier loading, for fibrous dusts, and for commercial shops where others will be doing the filter cleaning. Life expectancy: long. Note: when used on wood dust, we do not recommend washing them.
Our MERV 15 rated NANO filters have the highest filtration efficiency with no sacrifice to air flow. The life expectancy is the same as our Blend filters mentioned above. These are special and we use them in industry to filter toner and graphite dusts. These are surface-loading filters and at 60 psi have a better dust release than the others. These should be considered whenever an extra level of confidence is needed.
35A Series Kits:
Are used for converting bag type units to pleated cartridge. This kit has been successfully adapted to most of the popular bag type dust collectors, including Harbor Freight, Jet, Delta, Grizzly, Shop Fox, General, Wood Tek, Penn State, Powermatic, Reliant, Steel City and more.
C Series Filters:
Have a round mounting flange with pre-punched holes. They are available in open/open, open/closed and dual flanged configurations. All filters are MERV 15 rated.