How to Get More Coverage and Power from Your Insulation Blowing Machine

February 6, 2015

You love it. Your customers love it. Your workers love it. Everyone loves it. It’s one big love fest – and it almost makes you want to get everyone together, hold hands and sing Kumbaya.

Except, of course, when you get the bill and you have to do payroll. And customers have questions much later about possible insulation gaps in their attics.

See, you know in your head and heart that our insulation blowers are the best and most powerful tools on the market. As a blown-in insulation blower and vacuum manufacturer, we at Capitol Machine understand your angst. After all, we know that our machines do the job right – but there’s a key aspect that some of the users of our machines may be overlooking.

These blowers pack a lot of wallop – and if used incorrectly or improperly, you’re going to be sending that wallop to all the wrong places and probably way too much of it. (Too much “wallop” here, not enough “wallop” there.)

The Proper RPM for Your Capitol Machine

Don't Use All the RPMs Your Insulation Blower Has Available

The misconception about these powerful blowers is that turning up the RPMs does the work faster and better. Wrong! This is overkill (and under kill). Anything above 3,000 RPM is comparable to taking your kids to school in a supped up race car on high octane gasoline along residential streets in heavy traffic. You had better learn to manage that power properly or learn to walk long distances on a regular basis. You don’t need 12 cylinders when four will do. The best RPM speed for fiberglass insulation machines is 2,600 to 2,700 RPM. And that’s it! Throttle down, dudes.

Running the machines at the higher speeds also means the material isn’t mixed adequately and may lead to clumping. Proper machine speeds allows the material to be used conservatively and effectively and it correctly preconditions the mix before it is emitted. For you as the contractor, that means you pay for the material you use; none is wasted by being dumped into attics and other spaces.

Many of the machine settings depend on the product mixture and the effect you want to create, but as a general rule machines should never exceed 3,000 RPMs. Slower is usually better.

How Far to Open Your Material Gate

How Far to Open the Material Gate of Your Insulation Machine

The best method: When blowing fiberglass, turn the material gate of your blower to about half of the way open. This will set the machine at the best speed to get the job done right. Remember, more is definitely not better when you have that much power.

When blowing cellulose insulation, the most optimized opening is a quarter of the way. The higher RPM speeds prevent the machines from operating efficiently.


As a point of fact, machines that are run at excessively high speeds generally use 15 percent more product, and at $20 to $30 a package, that can add up. These machines have more engine than most jobs will ever need – which means the machines will last longer and be able to handle the tough spots when necessary.

We at Capitol Machine hope you found this information useful and will lead to cost savings. Good training and instruction for your workers can make everyone happier – especially the boss, who has to pay the bills.

Looking for some powerhouse equipment that’ll get the job done right? Contact us. We’d like to hear from you. Share some of your ideas with us in the comment section or on any of our social channels.