Tundra II Furnace Installation and Operation Manual
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Appendix 3: Optional Fresh air return adapter (AC01392)
The optional air return adapter (AC01392) can be added to the furnace blower box to
increase the efficiency of your system. This option allows you to take in the fresh air from
the rooms connected to the return system and bring it back towards the furnace to be
heated. This option can be installed on either one of the 3 sides of the blower box.
Complete installation instruction can be found in the instruction booklet provided when
purchasing this option.
1 fresh air return adapter
2 caps
1 filter
N.B.: TO ENSURE ADEQUATE STATIC PRESSURE, THE SYSTEM SHOULD BE
BUILT IN A WAY THAT THE VOLUME OF COLD AIR RETURN IS AT LEAST EQUAL
OR SLIGHTLY HIGHER THAN THE VOLUME OF THE HOT AIR DISTRIBUTION.
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