Thor Kitchen HRH3001U Installation Manual And User's Manual page 6

Clearance
Caution: Before installation, inspect the maximum height of your ceiling, Check the distance between
the bottom of the range hood and the countertop of your cooking appliance.
The required distance from the countertop of range top/ cook top to your Thor Kitchen Range hood
should be between 27" to 30".
For clearance more than 30", it will affect the efficiency of the hood.
For the clearance less than 27", the extra heat from the range top/ cook top will potentially cause
damage to range hood switch button/ display control board.
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