IRRD-DW2 Insulated Access Door Solution

Solution for double-wall round ducts with a very thick insulation.
Excellent insulating properties, since there are no thermal bridges.
For this solution two independent RRD access doors are combined (one for the inner duct and the second one, preferably larger, for the outer duct) depending on the circular double-skin duct characteristics and the insulation thicknesses. 

Minimum insulation thicknesses:
 -   IRRD-DW2 18: ≈ 42 mm
 -   IRRD-DW2 21: ≈ 42 mm
 -   IRRD-DW2 32: ≈ 55 mm
 -   IRRD-DW2 43: ≈ 60 mm


  1. Inner duct wall
  2. Outside duct wall or hard aluminum outer skin
  3. Insulation thickness (please observe the minimum insulation thicknesses)
  4. RRD access door
  5. Second RRD access door (can normally be made of the same material as the outer duct, liken in aluminum when the duct is covered with a hard aluminum skin)

Optimale Isolierung, da es zwischen den Revisionsdeckeln viel Luft gibt. Um eventuelle Konvektionsströmungen zu vermeiden, können hier Abfallstücke der Isolierung zwischen den Revisionsdeckeln platziert werden.