b) Need to crawl on hands and knees under ductwork carrying filters,
c) Need to climb over a rooftop screening fence to get to roof
mounted HVAC equipment.
d) Use of a vertical ladder to open a roof hatch while carrying
filters, tools, etc.
e) Need to rig a portable walkway in a ceiling assembly to approach
a remote fan coil unit or other equipment.
VAV System Design. Unless VAV systems are well designed and
expertly installed, problems can develop. Refer to Appendix C for design
Ductwork Pressure-Velocity Classification. It is essential that
ductwork pressure-velocity classification be specified clearly in drawings for
each duct system. Note the following:
a) Ductwork pressure-velocity classification may be different for
different ductwork systems.