Air Conditioner Spares - 3m exhaust extension hose For extending the reach of the exhaust hose Price: £35.25 incVAT This extension hose will enable you to position a portable air conditioner further into a room than normally possible with just the exhaust hose supplied with the unit. The 150mm diameter, 3m extension hose is attached to the existing 125mm exhaust hose with the duct tape supplied. The end is then positioned out of a slightly opened window or door. IN STOCK NOW. FREE MAINLAND UK DELIVERY IN 2-3 WORKING DAYS.