30
4
INSTALLATIONSTÛV 21
.3 OPTION: AIRTIGHT BOX
Step 20 For DF model, connect the
airtight boxes together at the end that is
opposite to the external connection. It is
recommended to have a 6" outside air
inlet for 21-95 DF and 21-125 DF models.
Step 21 Position the airtight box in its
correct location under the fireplace.
Step 22 Attach the airtight box to the
fireplace with two screws.
Step 17 Affix the self-adhesive gasket of
the airtight box on the upper rim.
Step 18 Using the 3 self-drilling M6 screws
provided, secure the short flange to the
chosen side.
Step 19 Attach the duct to the short
flange using a clamping collar.
Clamping
collar
2120
191817
22
10mm
T25
4’’
4’’
6’’
NOT INCLUDED
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