Product review (4 stars): No Circuit Board- Hooray!
Searching for a range hood is a frustrating process. None of them seem to be built as well as their high price would suggest.  Features are bundled together, so that it is difficult to get, for example, a strong, high capacity hood without a lot of bells and whistles that you might not want.  One of the features that I wanted to avoid was an electronic circuit board in the hood.  I have unreliable power where I live and have had to replace circuit boards in other appliances.  The price of replacement circuit boards seems outrageous given that they are sensitive components prone to failure, particularly in a high heat environment.  Like the auto industry, the range hood industry makes a lot of profit on replacement parts.  As an exercise, I added up the cost of purchasing separately all of the components of a common $400 range hood.  The cost of replacing all components was over $1700.

After much frustrating searching I called Broan technical service to ask if they could suggest a minimum 450 cfm hood without a circuit board.  A knowledgeable gentleman directed me to several hoods, one of which was the model 893004. This stainless, 30 inch under cabinet hood is old school in character, with only two on/off switches for the fan and light, and a rheostat (slider) to control fan speed.  On high speed it will completely exhaust smoke from pans on the front burner.  My unit is vented directly through the wall.  I removed the internal damper and rely solely on the wall vent external damper as the internal damper catches more grease and can eventually begin to stick.  In a cold climate you might want to retain the internal damper.  It will accommodate two 75 watt bulbs and illuminates the cook surface very well.  The noise is acceptable, and the design, while not modern, is attractive.

When initially installed I noticed that the blower unit wobbled slightly and created vibration in the hood.  I called Broan service  and they quickly sent me a replacement blower- five stars for customer service.  Minus one star because this range hood, and I suspect all range hoods, could be built better for a couple nickels more.  For example, one part of the metal blower unit simply rests on a metal ledge in the hood- no screws.  This seems like a likely source of vibration so I cut a small strip of rubber and placed in on the ledge between the two metal surfaces.  In a perfect world, where quality was paramount, this would be done at the factory.