Cable ladder: rungs on top?

[Anonymous user]

Having a cable ladder (6") installed by APC between NetShelters, across a "cold" aisle. Learned something new today--the installer from APC says they install them with the rungs on the top.
I looked at the documentation and it shows the rungs on top:
http://sturgeon.apcc.com/techref.nsf/partnum/990-1576A/$FILE/990-1576A-EN.pdf
however the submittal drawing shows the rungs on the bottom:
http://www.apcmedia.com/salestools/ASTE-6BFNZW_R1_EN.pdf

In a reply to a different post about racks in the forum Data Center Design » Architectural Design:
http://forums.isxusergroups.com/thread.jspa?threadID=137&tstart=0
a tip I got to improve the appearance was to line the ladder with "fish paper" liner (vulcanized insulating paper) so that you do not have to look up at the cables. I guess for this you would have to put the rungs on the bottom.

[Anonymous user]

Thanks. We turned the ladder over to have the rungs on the bottom.
I did open an online APC support question just to see what they would say: I just got a one line answer back--to put the rungs on top.

[Anonymous user · Accepted solution]

Having a cable ladder (6") installed by APC between NetShelters, across a "cold" aisle. Learned something new today--the installer from APC says they install them with the rungs on the top.
I looked at the documentation and it shows the rungs on top:
http://sturgeon.apcc.com/techref.nsf/partnum/990-1576A/$FILE/990-1576A-EN.pdf
however the submittal drawing shows the rungs on the bottom:
http://www.apcmedia.com/salestools/ASTE-6BFNZW_R1_EN.pdf

In a reply to a different post about racks in the forum Data Center Design » Architectural Design:
http://forums.isxusergroups.com/thread.jspa?threadID=137&tstart=0
a tip I got to improve the appearance was to line the ladder with "fish paper" liner (vulcanized insulating paper) so that you do not have to look up at the cables. I guess for this you would have to put the rungs on the bottom.