CFM Ratings

One of the first questions we get asked about the Razaire 530 is How many CFM's? While it may seem like a simple enough question, the answer gets a bit complicated. we'll try to explain. CFM stands for "cubic feet per minute", and indicates how many cubic feet of air can be moved through the fan in one minute. The theory is, the more CFM the better, but this is not necessarily so.

Static Pressure

Another factor governing fan performance is something called static pressure is measured in inches of water gauge. Static pressure is basically anything that restricts the air coming into the fan, for example, a filter. Obviously a clogged filter would provide more static pressure than a clean filter. So heres why our choice of fan was so critical to the performance of the Razaire 530. The fan we chose for the 530 is actually a high-tech version of a fan called an impeller, and it is rated at 530 CFM! Impellers are much more efficient than other types of fans (unfortunately, they are also more expensive).

Axial Fan

The regular type of fan that most people are familiar with is called an axial fan rated at 550 CFM may sound more powerful, but it isn't. Putting a new filter in front of it introduces approx. 0.15" static pressure, dropping the CFM rating to only 200 CFM. Getting a load of sawdust in the filter increases the static pressure to over 0.2", reducing airflow to below 175 CFM. By the time static pressure gets up to 0.4", airflow has dropped below 20 CFM or about half that of a bathroom fan.

Razaire 530 Impeller

Now let's look at our impeller. At 0.15" static pressure it still moves over 500CFM. At 0.2", airflow is still above 485 CFM. At 0.4", airflow is over 400 CFM. The impeller will move air all the way up to 1.5" static pressure. Other advantages of the impeller are several. Because of the blade design, the blades will not load up, so they should never need to be cleaned. Also, as static pressure increases, the impeller actually uses less electricity, so it won't burn out from too much pressure. Our impeller is built to last and last.

The brushless Foredom 1050 micromotor is ideal for various applications at high, medium and low speed, and offers high torque throughout the entire speed range of 1,000-50,000 rpm. The control box has an easy to read digital display for precise speed and torque settings.

You will wonder how you ever did without these handy sanding cones. They are quick, convenient, and economical. Best of all, they do an incredible job of fine sanding and blending in those hard-to reach areas that all wildlife carvers encounter all the time.