what would be less noise?

This is probably going to be my biggest issue sound control that is so every little bit helps. sp I was just about to order one of these metal duct reducers but relised they had a plastic one and thought it would be quieter i guess less fibration im not sure what you think?

plastic http://www.ebay.com.au/itm/DUCT-REDUCER-200MM-150MM-HYDROPONICS-INLINE-DUCTING-/400283520066?pt=AU_Seed_Starting_Hydroponics&hash=item5d32c1cc42

metal http://www.ebay.com.au/itm/DUCT-REDUCER-200MM-150MM-ALUMINIUM-/200587620449?pt=AU_Seed_Starting_Hydroponics&hash=item2eb3f43061

Try insulated ducting and if you can hang the fan

bongwaterbob said:

Try insulated ducting and if you can hang the fan

Click to expand...

good advice

yer i have got that covered also making an mdf box around my fan with insulation inside. i guess ill get the plastic reducers