I'm working on a test method for the performance rating of range hoods. For the same device the test should give the same result in any laboratory. The laboratories can be located at different altitudes and thus they test under different air densities. One part of the test is to measure the fan...
I am specifically interested in the case of range hoods that exhaust cooking fumes. Let's say the speed setting on the display panel is fixed. Can the revolutions per minute vary depending on the air density or static pressure?
I have a question concerning the electric motor that drives a fan. A fan can experience different loads depending on the pressure build-up in the ducting behind the fan and depending on the air density. Do fans keep their revolutions per minute constant if the pressure build-up or air density is...