Bosch HBL33 Guide D'installation page 6

Combo Oven with Microwave and
Warming Drawer 27"
It is good practice, when oven is installed at the end of a
cabinet run, adjacent to a perpendicular wall or cabinet
door, to allow at least 1/4" space between the side of the
oven and the wall/door.
For oven support, install 2x4's extending front to back flush
with the bottom and the side of the opening. The supporting
base must be well secured to the floor/cabinet and level.
The cabinet base must be flat and capable of supporting a
weight of at least 369 lbs (167 kg).
English 4
27" Under-the-counter units
It is good practice, when oven is installed at the end of a
cabinet run, adjacent to a perpendicular wall or cabinet
door, to allow at least 1/4" space between the side of the
oven and the wall/door.
For oven support, install 2x4's extending front to back flush
with the bottom and the side of the opening. The supporting
base must be well secured to the floor/cabinet and level.
The cabinet base must be flat and capable of supporting a
weight of at least 193 lbs (87 kg).
.