Ventilation and Noise Control Resources

The Best Time to Replace Your Fans

Posted by Gary Leseman, P.E. on Jul 24, 2015 8:47:03 AM

Last month, we published an easy-to-use checklist to facilitate ordering a replacement fan or parts. Of course, the obvious question is knowing when a fan needs to be replaced.

Sometimes accidents happen and you end up in an emergency situation with one of your fans out. Ideally, you want to avoid that stress. We recommend replacing fans and fan parts before they are too far deteriorated. You can proactively schedule your replacements by looking out for some of these signs and avoid the hassle and potential losses that are often linked to emergency equipment replacements.

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Topics: Fan Engineering

The Easiest Way to Order Replacement Fan Parts

Posted by Gary Leseman, P.E. on Jun 10, 2015 2:23:00 PM

When you’re running a facility or rig and one of your critical ventilation fans goes out, the last thing you need is to waste your time going back and forth trying to compile all the information a supplier needs before you can begin solving the problem. Sometimes the fan is located in an area that’s difficult to access, which can make the information gathering stage drag on longer than needed.

We’ve created this helpful checklist to assist you in gathering the information needed to quote replacement parts or a complete new fan. (Click to access a printable version of this checklist.) 

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Topics: Fan Engineering

Louvers 101

Posted by Gary Leseman, P.E. on May 5, 2015 4:01:00 PM

A louver is a simple air system component that allows the passage of air from one side of a vertical opening in a wall, plenum, or bulkhead to the other side of the opening, while at the same time, depend on its design, prevents water, dust, or sand from traveling through the opening.

Louvers used on the intake side of an air system are called intake louvers. Likewise, louvers used on the exhaust side of an air system are called exhaust louvers.

Louvers fall into two basic categories:

  • Architectural/Commercial Louvers (like what you see on a building)
  • Industrial/Marine Louvers (like what is required for more robust applications)
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Topics: Fan Engineering

Pi Day 2015 - How Fan Engineers Celebrate

Posted by Ann Marie Shaw on Mar 3, 2015 9:32:31 AM

This month, we celebrate the wonderful mathematical constant π! Since 1988, physicists, mathematicians, engineers, and other number-enthusiasts have celebrated Pi Day on March 14 (3/14) every year. The event is marked with lively discussions about Pi, contests to see who can recite the most decimal places, and, of course, lots of pie! 

2015 is a special year—we will mark a sequential time that includes the first ten digits of π on 3/14/15 at 9:26:53!

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Topics: Fan Engineering

How to Measure Fan Noise

Posted by Gary Leseman, P.E. on Dec 1, 2014 1:48:00 AM

Fan Noise – Some Sound Basics

Sound is a physical occurrence. Sound is also what we hear. Interestingly, “sound happens” whether or not anyone is around to actually hear it. Fortunately, sound is governed by natural laws so we can measure, predict, and use it to our advantage just like the fan performance is governed by the Fan Laws.

So, what’s the difference between sound and noise? Simply stated, noise is unwanted sound. Noise is relative to the ear of the listener. I may like classic rock & roll music, but to someone else—it’s just noise.

Determining how noisy a fan is and what to do about it is not as straightforward as one might think. 

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Topics: Fan Engineering, General Ventilation, Noise Control

How to Read a Fan Curve

Posted by Gary Leseman, P.E. on Nov 3, 2014 8:15:00 AM

If you’ve never worked with a fan curve graph before, it can look intimidating. But don’t fear—it’s actually very straightforward once you break it down. Being able to read a fan curve will allow you to choose the best fan for the job, as long as the fan is properly tested and certified.

The first thing to note about the fan curve graph is that it has 3 axes:

Horizontal Bottom Axis = Air Volume Flow Rate (CFM or m 3/sec.)
Vertical Left Axis = Static Pressure (inches water gauge [wg], pascals [Pa], or mm water gauge)
Vertical Right Axis = Brake Horsepower (BHP or KW)
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Topics: Fan Engineering

The 3 Basic Fan Laws

Posted by Gary Leseman, P.E. on Sep 4, 2014 10:31:00 AM

Back in the Dark Ages of 1976, before we all had computers sitting on our desks and when engineers still used slide rules, I came to work at Eldridge as a very young sales engineer. At that time, I was given some advice by an older Eldridge engineer (my dad, Walter Leseman) that I am pleased to pass along:

“If you learn how to use the 3 Basic Fan Laws, you will know more about ventilation and fans than most anyone else you meet in the industry—these laws will keep you out of trouble!”

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Topics: Fan Engineering

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