You can also try this reference:
http://oee.nrcan.gc.ca/publications/infosource/pub/ici/caddet/english/pdf/R285.pdf
Might be worth it to do a search using "dual duct dual fan systems" (DDDF); personnaly, I've always thought about them this way.
Regards,
Frederic Genest, ing., M.Sc.A.
A pig with lip stick is still a pig.
Brad Acker, P.E.
I'm sorry, I don't have personal experience with pigs and/or lipstick, so I can't respond to that comment.
OTOH, in my experience, changing keywords and/or their order usually do help to get more results with Internet search engines. That's how this reference (among many) came out.
Regards,
Frederic Genest, ing., M.Sc.A.
De: Acker, Brad [mailto:backer at uidaho.edu]
Date: jeu. 05/05/2011 18:01
?: Genest, Frederic; Arpan Bakshi; bldg-sim at lists.onebuilding.org
Objet : RE: [Bldg-sim] RE : DFDD systems
A pig with lip stick is still a pig.
Brad Acker, P.E.