S&P RESPIRO Series Manual page 30

Make sure the length of the integrated tube (6) is the same as the wall thickness. The tube must end up fl ush with the inside
and outside walls.
The "M" dimension cannot be less than 250mm, if it is the wall is not suitable for the product.
Adapt the tube, if necessary, to the wall's thickness with the appropriate tools, in the appropriate manner, as shown below:
Once you have adapted the length of the integrated tube (6) to the exact thickness of the wall, position the outside wall at-
tachment (4e) on the outside wall as shown in the image below:
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Insert the centring diameter of the wall
attachment (4e) into the integrated tube (6).