Originally Posted by
mark beiser
Your example simulates extremes of air density, not of the static pressure the blower works against, completely different things.
There is an easy example that you have probably seen many times. Look at the amp draw and RPM of a blower motor in an air handler with the access panel off, vs the amp draw and RPM with the panel on.
When you pull the panel off, the motor is working against a lower ESP, so it loads up, causing the amp draw to go up, and the blower to slows down.