Altech BT300i - Duct Connection

V1 JUIN 2010 ALTECH Generation ALL IN ONE Type Heat Pump Water Heater Technical Manual
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6. Duct connection
A: Air inlet & outlet without canvas B: Only air outlet with canvas, A≤10m
When there is stable heat source in room in winter
C: Air inlet & outlet with canvas, A+B≤10m D: Only air inlet with canvas A≤10m
Charge fresh air from ambient in summer