Can't you just cut the duct into 2 pieces and attach to each end? Putting the miner instead could cause a large short since it looks like that material might conduct, or it might go on fire.
yes he can do that
Psu
V
____________ V ____________
V
V
out<<< Miner--Pcie----Miner <<<___________ ____________
Above would be fully cut tube 1 miner
he may find two tubes work first tube 3 feet second tube 6 feet both tubes go over the miner up to the pcie wires.
I have done all those methods along with an small down clock of freq and dropping fans to 40 or 50 %