This gauze burner is a larger version of the standard Clevedon steam firetube burner. It is roughly twice as efficient as a ceramic burner. The mixer tube internal diameter is 5/16"/ 8mm and will accept the Clevedon steam no 8 gas jet pipe assembly which is required for this burner. A no 12 jet can be substituted.
The burner skirt has an internal diameter of 35mm to be a push fit on a 35mm flue. If it is required to fit in a larger diameter flue, an adaptor will need to be made. The mixer tube length is 2" / 50mm and from the edge of the skirt to the head is 1" 3/4 / 45mm. The burner head diameter is 28mm.