Thinking about having 4-7 80mm 21db fans all exhaust

[DumpALump]

I am going to be building a new case out of plexiglass. The reason is my PC-60 case is really too small for watercooling(well it's watercooled now...... but I'm bored ). So I want to put the HC down in the bottom front with every crack and hole sealed up with rubber or liquid nails. Then I want to put in 4-7 80mm 21db fans for exhaust. This should pull only air through the heatercore and cool all the components in the case.

So I suposidly would get maybe 150-200cfm going through the HC with low db.

I also have a 172mm fan that on 5v is probably 30db... not sure on cfm but I'm sure its a lot more than one of these 80s. Would having 3 of these be better? They are a bit heavier so maybe it would cause stress on the plexiglass?

Would this work? Anyone try this before?


Edit: I also want to sound deaden the whole thing, cept for the HC and where the fans are. I'll probably use the cheap melamine.

 

[Korndog]

(4) 21dba fans is about 28dba all together, plus it may create more vibrating sound then a single large fan @ comparible dba.
i think 7 fans is about 32dba (don't have my dba calculator handy now) So basicly 100cfm (ur using panaflo 25cfm right?) to 175cfm is pretty comparibly to a 150mm-172mm fan. Besides that, you're not including that max pressure of the fans, larger fans tend to have better preformance @ high static pressures (HC are dense). Cfm isn't the preformance of the fan, its like comparing athlonXPs and P4s by mhz.