The 1 Piece Trim Collar 90 Degree are used to give an aesthetic finish where the chimney penetrates the wall of a building. The 90 version is used on horizontal penetrations with a 45 version...
9580P0180 2 Piece Trim Collar 90 Degreeis an item used with ECO ICID twin wall insulated flue. It is insulated with a 25mm thick high density rockwool insulation. Generally used