How do us stoves regulated convection fan speed

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Darkwing

Member
Oct 11, 2018
150
New Jersey
Hello...
I might sound funny, but i am wondering if someone knows how US Stove does regulate their convection fan speeds...
By voltage, amp or frequency changes...
Planning to replace squirrel cage with external inkine duct fan for noise decrease and cfm increase but would like to utilize that mainboard as powersource to keep logic and such, but dont want to burn down my fan motor

Thx