Ext. Ø400 x h300 mm Schiedel insulating ring to loftgennemføring Ø250 Ext. Ø400 x h300 mm schiedel insulating ring there together with schiedel chimney allows installation with hidden transition in ceiling structure. With it 75mm thickness past, the laws 300 mm height, gives isoleringsringen also additional security by by isolated ceilings.
