Heat exchanging device with connected collecting chambers

A heat exchanging device for exchanging heat between air and a fluid, the device comprising:

• first and second fluid-air heat exchangers;
• fluid-conducting first and second exterior collecting chambers each having a fluid inlet or a fluid outlet;
• first and second sets of fluid guides of said first and second heat exchangers being respectively connected in fluid communication with said first and second exterior collecting chambers;
• air guides for conducting an air flow for heat transfer between the air flow and fluid flowing in said fluid guides, said air guides being separated and sealed from said fluid guides to prevent fluid communication therebetween;
• and
• fluid conducting third and fourth collecting chambers between and spaced from said first and second collecting chambers, all of said fluid guides of said first and second sets being connected in fluid communication with said third and fourth collecting chambers, respectively, said first set of fluid guides extending between said first and third collecting chambers, said second set of fluid guides extending between said second and fourth collecting chambers, said third collecting chamber having a fluid outlet, said fourth collecting chamber having a fluid inlet connected in fluid communication in series with said fluid outlet of said third collecting chamber such that fluid flows from said third collecting chamber to said fourth collecting chamber, said first exterior collecting chamber being connected in fluid communication in series to said second exterior collecting chamber via a conduit connected to one end of said first exterior collecting chamber, an outlet being connected to an opposite end of said first exterior collecting chamber.