6. In the case of waste heat heating systems using the cooling air of the engine for heating purposes, the conditions of paragraph 6.2. of this Regulation are considered satisfied without the use of a heat exchanger provided that the following conditions are satisfied: a0c1
6. In the case of waste heat heating systems using the cooling air of the engine for heating purposes, the conditions of paragraph 5.2. of this Regulation are considered satisfied without the use of a heat exchanger provided that the following conditions are satisfied: a0c0