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What type of vent control?
Incremental
Choose this control if you have a non-computerized control and you want your vent to open in increments.
- Opens in increments, closed, 1/4 , 1/2 and full open.
- Primarily used with STEP50, STEP500, M-1608.
- This is a master control. If placed in the center it can have six 2R units, 3 on each side
- External limit switches
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