Canon MP 1000 User Manual page 25

Make sure there is enough room around the MultiPASS 1000 for
the paper to flow freely into and out of the unit. Also, make
sure there is adequate ventilation around the MultiPASS 1000. It
requires this much space:
15.5"
7"
17.3"
15.5"
7"
13"
20"
2-3
Chapter 2 Getting Started