IRRD-3DE

1. Duct wall
    
2. Insulation
    
3. The IRRD-3DE access door is made of an RRD access door with longer bolts fitted with a cover plate (3DE).

4. The cover plate 3DE should only apply a light pressure on the soft insulating material: the knobs (protected design) must therefore be tightened lightly.

5. The cut edge of the insulation is covered by the cover plate and offers a pleasing appearance.

6. The inside cover guarantees the air-tightness of the access door: the knobs must therefore be fastened firmly.

7. The air pocket trapped between the cover plate and the access door offers good insulating properties.To avoid any convection currents insulation chunks can be stuffed into the hollow spaces between the cover plate and the access door. This is also suggested in order to increase the sound insulating properties of the access door.

8. Several gaskets are available: PE, SKK, KF, SI, NBR.

9. To maximize the range of possible insulation thicknesses, metal knobs (they are less bulky than the plastic ones) are used on the inside access door.

10. The IRRD-3DE access doors can theoretically also be installed on insulated double-wall round ducts.
     

Available opening dimensions and insulation thicknesses

18    180 × 80 mm    A = min. 25 mm / max. 150 mm
21    200 × 100 mm    A = min. 25 mm / max. 150 mm
32    300 × 200 mm    A = min. 25 mm / max. 145 mm
43    400 × 300 mm    A = min. 25 mm / max. 145 mm