I'm not really sure it change really a lot... the isulation in on the outside of the duct... so it's more not to have the heat to diffuse to the exterior (the room), this is only my opinion... there are some muffler out there for these fan.
LuciferN Reviewed by LuciferN on . Think its female? I've been vegging this mystery bag seed for 50 some days and think it finally showed me her sex. Noticed a few hairs coming out, just wondering if I could get some confirmation on this. Hope you can see from the pics(not very good photographer). Thanks to everyone who looks on. Rating: 5