I got some for my 6inch fan but tbh the fan is so loud when it comes on full power you wouldnt notice the sound of air moving through the ducting anyway.Is it quieter? Non-flammable?
I use insulated, its actually cheaper than the foil duct here because the duct inside the insulation is made of cheaper heat resistant plastic. I run two 1000 watt lights thru it and no probs. It probably gets over 100f inside there...