A number of other conclusions can be drawn from the literature.
First, vertical laminar airflow units generally reduce airborne contamination better
than horizontal airflow units [8].
This is especially true when personnel isolator suits are not used.
Second, there is an inconsistent relationship
between surface and air bacterial counts, indicating
that measurement of air contamination represents
an unhelpful method for the assessment of surgical
site contamination in laminar airflow units [11].