Why?
Opposed to other known pollen collecting drawers, this drawer is made without any ventilation gaps
on the bottom and sides; this is due to three hygienic reasons:
the drawer is much easier to clean;
the absence of gaps prevents other types of insects to feed on pollen;
in bad weather (humidity over 60%), the pollen absorbs moisture from the air, which is not the case if these ventilation gaps are not present.