I believe the OP is referring to this type of carbon sheet...Yes, you can use too much depending on the cfm of your fan.
I've never heard of carbon sheets before...where did you get these and what are they intended for? I'm thinking of carbon copy paper, like the old credit card receipts?....
Before you build your filter, you should find out the dimensions of a commercially made filter. Then build yours to the same surface area and bed depth to ensure proper performance.
I'm just running a couple layers of the sheet on my filter and it works like a charm! Here's a pic of mine...thats exactly what im doing!So what do you think,just carbon sheet,or carbon sheet and activated carbon?
Ahh...I see. Well thats gotta be the easiest diy filter I've ever seen. Whats the life span though?I believe the OP is referring to this type of carbon sheet...
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...and has constructed something like this...