As promised, here are a few of David’s tips for hanging art in a grid formation:
To determine the space between the frames, double the width of the frame. So, if your frame measures one inch, then allow for two inches between frames.
Make sure all of the mounting hardware (including both D-rings) is positioned at the same height on the backs of the frames. This will make plotting and placement easier because it is more secure to hang art from the two D-rings than the wire.
When you hang art on the wall, the top of the frame will stick out slightly because of the mounting hardware. Ask your framer to add a bumper to the bottom of the frame because it evens out the way the frame hangs on the wall.
Always wear gloves when handling art.
Kevin Sharkey 
From: Christina | 3/4/10 at 6:27 pm
Thanks for the tips
The "bumper" idea is great- I have noticed that before and just thought it was the way it had to be!
From: Karla | 3/6/10 at 9:28 pm
I had a very similar issue with a deep vintage frame on a Chicago "plein aire" piece that is a family heirloom. I didn't want to replace the frame, so I ended up having to relocate the piece to a place where I could work with the lighting angle instead. I see in your narrow hallway that you don't have that option.
Good luck with the new framing - your hallway gallery will look fantastic when it's done.