August 2007 Issue

Letters: 08/07

I am a long-time user of the Swampy products including the IM30 that you reviewed and the IM20 all-in-one unit that you did not. In the seven years that I have used their products, I have been very satisfied and have had good results from both units—far better than your review showed. Out of curiosity, I did a temperature and CFM test on a 12-volt IM20 that I currently own. I tested the unit in two areas: in the hangar and in a car that had been parked in the sun for several hours. Unfortunately, my airplane is currently in for annual and several mods so I could not test the unit in the airplane. I also measured the air temperature of the car’s air-conditioning unit for comparison. The chart below lists the outlet air temperature at high and low fan speeds and the cubic feet per minute of air moved. I used the excellent portable Mannix DCFM-8906 CFM Master II to do the measurements.

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