11) Connection for fresh air/branch duct (optional)
1.
The lateral holes are pre-stamped on the side board of unit body, with sticker indicating the location
and its usage.
2.
There is one lateral hole for fresh air duct connection to intake fresh air.
3.
There are two lateral holes for branch duct connection to deliver the treated air to the adjacent room.
4.
If need connection the flange, please work before installing the unit to the ceiling.
5.
Look for the sticker on the unit body for location of the lateral hole and its usage.
6.
Use a cutter to open the lateral hole.
7.
Connect the flange to the hole with 4 tapping screws.
8.
If connect the branch duct, please use blanking plate to block the air delivery channel respectively.
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