Quite expensive, thin material

The material is quite thin, at a job was a material error and there you could almost see through. Since the mats but must be cut anyway, I could knock out this error.
4 metal rods for clamping on the filters are included.

Since there are no universal carbon filter mats, but provided directly for the DU 622/632, I would have thought they would be cut to perfectly fit. So you still have some work so that really does not have to be.
The whole construction with the pinch of these thin metal rods affects not thought much. This has it all kind of very simple. Especially as this carbon mats yes also needs to change from and. Because I would have liked a reasonable design, a kind of clamp frame might.

If you use the Bormann hoods in recirculation mode, the charcoal filter is at least necessary and of course he does exactly its purpose. The quality meets the Bormann hoods, so rather simple quality. Just as the rather ill-conceived style and manner the carbon filter mats to install.