Yes, yes and yes but not enough to worry about unless you put a kink in it.

TomStoner Reviewed by TomStoner on . lightproofing, need help !! Hey I have the inside of my grow cab lined with black/white film with lips covering the seems of the doors, and my intake is a pvc elbow facing the rear of my box. Only problem is that I have my exhaust fan mounted on my box with a hole cut to fit, and I have no idea how to light proof it. Any suggestions would be awesome, and greatly appreciated :) Rating: 5