I recently bought a thermador stove/dishwasher package and (in a seperate transaction) a Thermador vent hood. Installation of the stove was reluctant
but adequate, and they refused to install the dishwasher. Installation of the thermador vent hood failed - the hood ripped out of the wall. That hood was irreparable damage (my three month old thermador stove took a minor dent), so they sold me a replacement that is of high quality and that I like, but I did not pay to have A & P install it. I installed it myself and, after looking at the previous installation, and doing one myself, I can only conclude that they drilled too large of guide holes for the mounting hardware during the previous installation. There was plenty of solid wood to mount to. Nice hood, glad I Installed it myself though.