On Wed, Aug 5, 2009 at 12:38 PM, David Beierl<dbeierl@attglobal.net> wrote: > Muffin (R) and similar box-type fans are designed to be thin so as to mount > easily into equipment chassis and such. As such they have coplanar motors > and in the smaller sizes (less than 8-inch, say) there isn't much room for > the fan blades. As such they run fast and noisy for a given output. The > Dometic fan OTOH was designed to run slow and quiet (rated input power is > 0.7 watts, BTW, about 60 ma -- so at 270 ma yours obviously has problems or > is in fact not an original) without regard to size. >
Thanks David. Appreciate the insights into fan design. Makes total sense. I can see what you mean in terms of blade design. Likely my Dometic motor dirty inside and/or has worn armature bushings. Found it curious there was such a relatively high draw for what looks like a small motor. Either that or I used my VOM incorrectly. Pretty sure it was wired in correctly though. Neil. -- Neil Nicholson '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines |
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