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NSM

National Safety Mirror

FAQ/Dome Sizing

Quarter dome dimensions

Dome Mirror Sizing FAQ

Clarify full, half, and quarter dome sizing so ordered dimensions match installed expectations.

sizingHow are quarter dome mirror sizes measured?
Full and half dome mirrors are sized by the diameter of the original full dome. Quarter domes are based on that same full dome diameter, so the straight edges of a quarter dome are roughly half the listed size.

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educationWhy does my quarter dome mirror look smaller than the size I ordered?
A quarter dome uses the radius of the original full dome as its straight-edge measurement. For example, a 32 inch quarter dome will have straight edges of about 16 inches because it is one quarter of a 32 inch full dome.

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