Surface Mounting Of Access Control Product

Many of new Access control products are surface mount type so it requires to make duct/hall (square) on flat surface (wall).

it is always challenge to create precise hall on surface as per dimensions provided from product manufacturer. generally such products design have some margins to allow installer to fit the product in slight plus dimension on surface hole.

do you know the minimum duct/hall margins should allow to installer by product manufacturer ?

is minimum product margin is depend on surface type i.e. concrete or wooden or metal surface ?

is there any standard for same ?

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