At last! The arrival of the twin-walled plastic conduits tubing has occurred today this morning! But not all of it! We ordered three different sizes: 100mm, 63mm and 40mm diameters but there seems to be a country wide shortage of the 40mm size and our supplier has been waiting to see if any would come in their own warehouses. But after we had made enquiries and explained to us the situation, they split the order up and sent us the two larger sizes with the smaller one pending, maybe in a week or so if they can source the conduit from Europe.
So we now got two 25metre rolls of orange of the 63mm (internal size of 50mm) and one roll of 25metres purple 100mm (93mm internal) conduits, ready to construct our air circulation system, the 63mm one to help supply fresh air to all four walls in each room (under the flooring) and the 100mm tube to take away the old stale air inside the ceiling.
The smallest size, the 40mm one, we would like to use to guide the electrical cables around the obstacles like windows and doors, connecting each sections of the Utility Channels running around the room, but if we cannot get this type, the twin-walled conduits, we will have to find an alternative design and perhaps one option is to find a supplier of vacuum tubing or maybe the cheaper end of water hoses.