Panel inspection port

Can only be used for the maintenance of the ceiling, not for the side wall.
As the sample: internal plate and frame is separated from
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; maintenance can flat internal push shifted to the next can repair < br / > If you want to achieve the effect of both repair and ventilation, the interior can not do flat, made of blind, bar, small fixed, etc..
Edge width 3 cm