Ventilation arrangement for the interior of a vehicle, in particular a heating and/or air-conditioning unit for a motor vehicle

Ventilation arrangement for the interior of a vehicle comprising:

• at least one of a heating unit and an air-conditioning unit;
• a fan for air exchange in said interior;
• an adsorption filter for the adsorption of odorous and/or harmful substances contained in an air stream delivered by the fan;
• wherein said adsorption filter contains at least four plies of spherical active-charcoal adsorbers deposited on a carrier matrix,
• wherein the spherical absorbers and the carrier matrix have a specific surface area of greater than 950 m.sup.2 /g, a partial size distribution of 0.6+/-0.05 mm statistical means, more than 85% of the particles being begwen 0.3 mm and 0.85 mm, more than 80% of the particles being betwen 0.5 mm and 0.7 mm, an absorber deposit on the carrir matrix of about 1400 g/m.sup.2, a characteristic valve of the carrier matrix of approximately 22 ppi, and a micropore fractin in the carrier matrix exhibiting Benzene absorption of greater than 35% by weight at 10% saturation at a temperature of 20.degree. C.
• whereby, for the widest possible spectrum of odors and harmful substances, an initial adsorption nrate of said adsorption filter is so high and a desorption rate is so low that, on a sudden occurrence of an increased concentration of odorous and/or harmful substances in the air stream and during subsiding of increased concentration, a quantity of odorous or harmful substances passing with the air stream into the interior remains below a preset nuisance threshold.