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Kress RK-20 or RK-720???

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Kress RK-20 or RK-720???

Old 08-20-2008, 06:24 PM
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Default Kress RK-20 or RK-720???

What is the differance between the RK-20 and RK720 fans and which one would be the best for a OS 25VFDF?????
Old 08-21-2008, 09:58 PM
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Default RE: Kress RK-20 or RK-720???

Your OS .25 vfdf would be appropiate in either Kress RK-20B or the RK-720. The major difference between these Kress units is the Fan diameter : RK-20B is 4" and the RK-720 is 3.5". Other differences is housing material and mounting in the housing/tube.
The potential for more thrust is in the RK-720 (more power to turn a smaller fan at a higher speed).

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