NFPA 96-2011 A.220.127.116.11 (1) states " ... All roof exhaust fans (whether through the roof or to the roof from outside) should have ready access to all sides from a flat roof surface without a ladder, or they should be provided with safe access via built-in stairs, a walkway, or a portable ladder to a flat work surface on all sides of the fan."
I am looking for guidance on the following:
1. How far on each side of the fan must the flat roof surface/flat work surface extend?
2. Does flat imply horizontal, or does it imply the opposite of bumpy/uneven