Support for the floor duct bracket.
From a length of 392 mm BKHR the use of BKHRU is recommended. The support does not need to be screwed to the floor. No dowels have to be placed.
Support for the floor duct bracket.
From a length of 392 mm BKHR the use of BKHRU is recommended. The support does not need to be screwed to the floor. No dowels have to be placed.
BK floor duct - Technical information 
Floor ducts - Assembly instructions