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Wells Concrete Teams Up with Tennant for a Cleaner Sweep

The Wells Concrete plant in Albany, Minnesota, USA designs, manufactures and installs a variety of structural and architectural precast wall panels. Workers pour insulated and solid concrete wall panels in a huge warehouse space of approximately 180,000 square feet.


Silica is a natural substance found in materials common on construction sites, like concrete, rocks and sand. The dust created by cutting, grinding or drilling concrete products can contain respirable crystalline silica. Over time, exposure to these silica particles causes scarring in the lungs, which can harm your ability to breathe according to The American Lung Association.

The control of airborne silica dust is a constant challenge for industries that create the dust. And OSHA [Occupational Safety and Health Administration in America] is insisting that employers ensure workers are safe and silica dust exposure is minimised. Companies will need to comply with the new OSHA rule, part of which includes creating an Exposure Control Plan to demonstrate how they are implementing changes that move toward compliance.

The key to preventing silica exposure is to keep silica dust out of the air. That’s a tall order for a giant manufacturing site. Former methods like broom sweeping are neither efficient nor effective.

‘You can imagine, if someone were to ask you to clean your house with a toothbrush, that’s what it would be like when we use a floor broom to clean our factory’, says Ben Dalsing, Wells Concrete Plant Engineer. The OSHA rule prompted the Wells team to look to Tennant for a solution.

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‘It works great. We keep our floors clean and we keep dust out of the air’.

Ben Dalsing
Plant Engineer
Wells Concrete


Tennant offers three types of dust control methods that can be used to support OSHA silica control housekeeping requirements. As Tennant was developing its offerings, they needed a location to test their HEPA-enabled sweeper and Wells decided dry sweeping with HEPA filtration was an ideal solution for them. ‘Tennant wanted a testing ground for a machine with a HEPA filter, and I graciously offered our factory as a very dusty environment’, explains Dalsing.

The Tennant S30 is a versatile and durable mid-sized industrial sweeper with a three-stage primary filter system, plus the option of a 4th stage HEPA dust filter.

‘A HEPA filter has a special filter media that can clean to a very high standard by removing microscopic particulate from the air’, says Mat Segar, Tennant Current Products Engineer for Sustainability. The S30 with HEPA filtration sweeper has been in testing for over 60 days and has picked up over 9 tons of dust and debris. Segar goes on to say, ‘the impressive thing is that the primary filter system is so effective that the HEPA filter has only gained a half a kilogram of debris within that timeframe’.

Based on the Wells testing, the HEPA filter should last at least six months, possibly up to a year depending on the customer’s application. Proper usage and maintenance practices will help increase the effectiveness of the machine’s filtration stages and the life of the HEPA filter for up to six months, perhaps longer.

S30 Ride-On Sweeper Filtration Stages

Stage 1 – Perma-Filter™
Tennant engineered design helps keep bulky debris, moisture and dirt in the hopper removing 90% of particulates from the air stream.

Stage 2 – SweepMax® Plus Cyclonics
Longer filter life with exclusive cyclonics dust control that removes an additional 90% of dust particles from the air stream before reaching the filter. 

Stage 3 – Canister Nanofiber Filter
MERV 15-rated, flame retardant Donaldson Ultra-Web® filter loads and shakes-back 70% more effectively and provides cleaner air from filtering submicron dust particulates down to 0.5 microns at 99% efficiency

Stage 4 – Optional HEPA Dust Filter
Dry system providing a filtration efficiency of 99.97% to 0.3 microns.


Wells Safety Manager, Mike Frieler, measures the dust in the air at the plant and says he’s seen improvement with the new sweeping system. ‘It’s a lot cleaner than just a broom and a dustpan. It contains the dust within the filters, so you don’t have it floating in the air and people breathing it in. A lot better than the old way’, says Frieler.

‘The act of pushing a broom, kicks dust up into the air. And that’s one thing that OSHA doesn’t want anymore. So, we’re using the Tennant sweeper to capture the dust and debris’, says Plant Engineer, Dalsing.

The Tennant S30 not only helps create a healthier environment for workers, it’s more efficient too. ‘I’m estimating that it takes between ten and fifteen hours of pushing a broom to clean our entire factory and the Tennant machine can do that in anywhere between a half hour to an hour and a half’, Dalsing states.

‘This will allow you to have one operator be much more efficient, do the same amount of cleaning in a very short period of time, where you can free up operators to do other things’, says Product Engineer, Segar.

While it was the OSHA regulation that encouraged Wells to seek a healthier cleaning option, the company is committed to keeping its workers safe. ‘As a company you invest in your employees, so if you’re not taking care of your employees, you’re not going to have a company’, says Safety Manager, Frieler.

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