How to Calibrate a Make-Up-Air Controller?
All fresh air intakes do is provide a slight positive pressure within the home.  This means inside air is pushed out through non-airtight spaces in the building envelope as there is slightly more air pressure inside than outside and nature abhors a pressure gradient.  

Without an intake there is normally slight negative pressure where outside air is sucked inside from all over the place creating cold drafts during winter.

With positive pressure you don't feel drafts, outside air gets sent through furnace air filter slightly cutting down on dust accumulation.  Air consuming devices&mdash;bathroom and kitchen vents, gas furnaces, gas water heaters, fireplaces&mdash;work better/safer.

Unless your furnace/ducting/returns are sized/designed incorrectly and the envelope of your home is being over-pressured, only same amount of air that would normally be leaking in from cracks is sucked into the fresh air intake to replace that escaping air.

This situation is all very different from a mental picture of a fan operating in a large open space where the amount of "sucking" is always proportional to amount of "blowing" where the higher you turn up the fan the more air is sucked in.

In your home an intake works more like a fan blowing into an enclosed box:  no matter how much you turn up the fan "sucking" is unchanged if there is nowhere for the air to go.

Within reason (e.g. no over-pressure) no matter how much faster the fan turns sucking of outside air can only be proportional to the amount of air leaving the home.  Most of the energy goes into moving inside air around between supply and return ducting.