5
©
2014
Daikin
North
America,
LLC
Bottom
Return
Air
Opening
The
bottom
return
air
opening
on
upflow models
utilize
a
“lance
and
cut”
method
to
remove
sheet
metal
from
the
duct
opening
in
the
base
pan.
Unfold
the
duct
flanges
around
the
perimeter
of
the
opening
using
a
pair
of
seamer pliers
or
seamer tongs.
WARNING:
Sharp
edges.
Gloves
required.
©
2014
Daikin
North
America,
LLC
Bottom
Return
Air
Opening
Airflow
area
will
be
reduced
by
approximately
18%
if
duct
flanges
are
not
“unfolded”.
This
could
cause
performance
issues
and
noise
issues.
Press
Out
by
Hand
Scribe
Lines
Outlining
Duct
Flanges
Cut
Using
Tin
Snips
Cut
Four
Corners
After
Removing
Sheet
Metal
