Dantherm HCV 4 Manuel D'installation page 6

Product description,
Air flow
4
continued
The air flow through an HCV is described and illustrated below:
No.
T1 Outside air
T2 Supply air
T3 Extract air
T4 Exhaust air
T2 T3 T4 T1
Description
Outside air entering the heat exchanger ready to be
heated by the extract air from the house
The supply air is heated by means of heat recovery from
the extract air
"Polluted" and warm extract air is used to heat up the
outside air by means of heat recovery in the heat ex-
changer
The heat of the extract air is used to heat the cold out-
side air. The exhaust air is led out of the house.