What is the effect of having a damper (in open position) construction in a raised-floor...

Perforated tiles with integrated dampers are common in raised-floor data centers because they allow airflow regulation at the rack level. However, even when the damper is fully open, the mechanism inside the tile restricts airflow. This typically reduces the delivered airflow by around 10% compared to a non-dampered tile of the same type.

Option A is incorrect because dampers do not affect supply temperature; they only throttle volume.

Option B is wrong since dampers cannot increase volume—they only add resistance.

Option D is partially true that dampers help with temperature balancing, but the main effect (in open position) is volume reduction.

Thus, the technical impact of dampers in open position is a slight airflow reduction, usually quantified as ~10%.