Installation of roof duct sleeve
![](../Images/png/164748555__Web.png)
View from roof side
- The PP 45 DFHK / PP 45 DFHL roof duct sleeve should be cut to length so that the sleeve has a projection of 1 cm beyond the PP 45 DH roof cowl. Cut the roof duct sleeve, flush on the inside, to the finished size of the interior wall.
![](../Images/png/164751883__Web.png)
View from the inside of the building
- On the inside of the building, clamp the supplied polystyrene wedges under the roof duct sleeve so that the sleeve has a gradient of approx. 1-2 % towards the outside. This is to prevent any condensate that occurs from running inwards.
The duct should be fitted with a gradient running from the inside to the outside
Failure to do so may result in water damage.
Exercise caution when handling construction foam.
Wear protective gloves and goggles.
![](../Images/png/164755211__Web.png)
- Remove the roof cowl and make sure that the position of the roof duct sleeve does not change.
- Check gradient to the outside again.
- On the outside, seal the gap between the roof duct sleeve and the roof outlet duct all around with construction foam.
![](../Images/png/164758539__Web.png)
- On the inside, also seal the gap between the roof duct sleeve and roof outlet duct all around with construction foam.