Aluminium ducting is the cheapest option, Combi Ducting is essentially re-enforced aluminium with a protective coating. Acoustic and Phonic Trap are sound reducing options which use acoustic insulation to reduce air noise inside your ducting.
Aluminium ducting is the cheapest option, Combi Ducting is essentially re-enforced aluminium with a protective coating. Acoustic and Phonic Trap are sound reducing options which use acoustic insulation to reduce air noise inside your ducting.