Green heck kitchen hood

[witjr_49]

I am having a hard time designing this hood. I am a mechanical contractor specializing in HVAC. I have a welding background. I was a welder before I became a technician Can someone help me with this?

[fireye03]

http://www.greenheck.com/pdf/kitchen/KVSAppl&DesignSeptember2005.pdf
this may help.