On 2/11/2012 10:44 AM, gregz wrote:
wrote:


The blower being restricted will start to use less power. It will tend to
speed up because the air just tumbles. I was wondering if my furnace had a
air speed sensor, which could detect flow, being a variable rate fan.

Greg


You're absolutely right.
I had it in my head that the power went up, then headed down
as the airfoil stalled.
Not so.
Just measured an axial fan and a squirrel cage blower.
Both powers headed down immediately with restriction.