I\'m building a new house in Denman nsw and I\'m putting in exposed ducting through out the house using your spiral type ducting and fittings. I will need at least 10 6M length of 305 mm tube plus 8 T type joiners and 8 to 10 400×200 wall vents. I will be having a friend of mine that\'s been in air-conditioning for over 30years to overseer the work. I will also need hanging rods, brackets and tube joiners that clamp the tubing together. Cheers Allan.