Thank you to Matt  in C-town for the following write-up.  We really appreciate the time and  effort that went into this.  It’s an excellent retrofit.  Thanks again  Matt!

Penn State DC2

from Matt in C-town

Conversion to a Wynn 35A274BLOL cartridge filter

I have been using this unit  for several years with the supplied 5 micron felt bags as a roll around  collector.  I have recently begun the project of renovating my shop.  Part of  this renovation is to enclose my collector (for noise reduction) and make it  into a central system.  This was the natural time to shoot for better filtration  and additional efficiency.  Wynn’s 35A conversion kit fit the bill perfectly for  these improvements with more than double the surface area and half the cost of  other brands.

After looking through the  different application notes on Wynn’s site I settled on George D’s retrofit with  some slight modifications (Thanks George!).

Using 3/4″ MDF, I roughed  out a circle on the bandsaw and finished it with a circle guide on my router so  that it was slightly larger than my collector’s intake housing (20 1/4″  diameter).  I then set the circle guide to cut a 1/2″ deep rabbit edge on the  circle to fit inside the intake housing (19 9/16″ diameter).  Once the outside  diameter work was done, I cut out the inner circle with a jigsaw (12 7/16″  diameter).

Next I created (5) clips out  of brass shim stock.

Once the clips were done I  could hang them on the bottom edge of the filter and layout out the positions  for the (1/4″-20 x 7/16″-14) thread inserts.

At this point, I ran a bead  of silicone caulk at the inside corner of the rabbit on the MDF donut and placed  it on the intake housing.  After throwing a couple of clamps on, I pre-drilled  and attached the donut with (5) sheet metal screws.  Then I placed the filter on  the donut and screwed it down with 1/2″ long 1/4″-20 cap screws, lock washers &  washers.

All that was left was to  hang the supplied 4 mil poly bag and attach the assembly to the blower unit.

Do you like my upside down  dust collector? J

In conclusion, I do feel  that there is a significant increase in airflow generated by my system based on  some standard operations I perform in my shop.  My jointer no longer clogs the  hose and there are no more retained chips in my tablesaw cabinet.  I will say  that after researching cartridge filters, Wynn Environmental is the best source  in both performance and price ‘hands down’!

Regards,

Matt in C-town  —   Cleveland, Ohio

General Information:

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.

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Industrial_Dust_Collectors

Industrial Filters

35A Series Woodworking Kits

Flexible Hose for Leaf Collection

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Wynn Environmental offers a complete line of air filtration systems, including Dust Collectors, Mist Collectors, replacement filters, flexible hose and more.  Please consider us your expert resource and know that we offer only quality products, which are made in the U.S.A..  Our experience, integrity, and service have been recognized in the industry since 1972.  Our goal is the same as it has always been…to give every customer the very best product at the very best price. We truly appreciate your business.

Please browse our website and check out our products, including a full inventory of:

• Aercology Filters
• Donaldson Torit Filters and Cartridges
• Murphy-Rodgers Filters
• Royal Filtermist Filters
• Airflow Systems Filters
• HEPA Filters
• Woodworking Filters and 35A Filter kits
• Flexible Hose
• Leaf Collection Hose
• Delta, JDS, JET upgrade Ambient Filter replacements
• Vibra-Shake (VS) Filters for Graphite, Toner, Carbide and other difficult dusts.  Vibra-Shake (VS) is a registered trade mark of the Donaldson Company.
• Lincoln Welding Filters
• HEPA Filters for the FPV Vacuum System

Rick’s been published!
Follow this link to see his Dust Collection article in the

Powder/Bulk Solids Magazine

…and again this past July!
(Click HERE)