Please cehck the following thread
http://rcrest.no-ip.com/viewtopic.php?t=1814&start=0
Hutchison replied that we can install designated only.
Usually it is safety related management won't refuse you to install. Don't want to take the responsilibity ma. But only designated design will be allowed.
I am willing to install the designated one but 7 inches width is very dangerous ! Children can drop down from the big gap (7 inches). Anyone will follow this issue ? Any photo of the designated frame for window ? :em13: