Abrasive Blasting 101
Thanks to these vacuum blower tips, buying a vacuum blower operated dust collector doesn’t have to be another “you get what you pay for” life lesson. Instead of assuming more horsepower and cfm are always better, an educated buyer understands the engineering behind the four common classes of blowers. If you need a quick refresher on how blowers work, read this post before you go on.
Once you know how these important pieces of equipment work, it’s much easier to understand what factors are important in your purchasing process. To help you along the way, we’ve compiled five tips to help you get the biggest bang for your buck.
Fun Fact: When you pull 1” of H2O (static) on a door you get just over .4 ounces pull per square inch against the door surface. If you wanted to open a door 36 x 84 inches you would need over 75 pounds pull to open the door, this shows how the selection of the class III blower design chosen for blasting cabinets came about.
There are 4 basic blower classes, one being vacuum blowers, which we explain here. Typically, a 120-volt vacuum blower moves 100 cfm or less, creating a negative pressure inside the cabinet which is required by pollution agencies. If your cabinet chamber is 36” x 30” x 24” you have about 13 to 14 cubic feet of chamber area accounting for the window slope area. That means you’re only getting about 7 air changes per minute, far less than 20 change per minute required by Air Pollution Control when a cabinet requires a permit.
To give you a reference point, many Media Blast models have one (1) air change per second.Because they are changing the air so rapidly, our machines come standard with excellent separator reclaimers to prevent abrasive loss and remove only dust.
Class III Radial Pressure Blowers are normally used to meet the guidelines required for all machines requiring a permit to operate.
You get what you pay for – but you can pay the same or more and get much less!
To ensure the best blasting cabinet operation, we recommend you make sure what blower type is best for your type of blasting. Give us a call or use our contact page if you’d like to speak to one of our experts.