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Welcome. My name is ***** ***** would be glad to assist.
Can you please, elaborate on the situation?
You have an exhaust fan and makeup air fan, correct?
Then sensors in the duct work?
What to you mean, "use instead of a control panel"?
Please give as much detail as possible.
Let me know and we can continue,
Yes, you can use your own starters for the motors.
Use your own cabinets to house them etc.
Build it yourself is easier in most cases
They just need to wire into the ansul system for operation and shutdown in case of fire.
See the diagram below for the most common:The one showing lights and others will be your makeup fan etc, It must shutdown and the Exhaust must stay on when fa fire is sensed by the system.