Module for ventilation and biological purification of indoor and outdoor air of an environment comprising: - a box body comprising • a first and a second wall facing each other, at least one of said first and said second walls comprising a sheet made of a material transparent to light, • a pair of sidewalls each one connected to said first and second walls and suitable for closing said box body laterally, • a base and a lid each one connected to the pair of sidewalls and to the first and second walls to close said box body at the bottom and at the top respectively, • a purification chamber where a biofilter is arranged for purifying an input air flow (A) entering the module , • two inlet openings (8', 8") suitable for allowing the air flow that has to be purified to enter in the purification chamber , each one of said openings (8', 8") being formed in one of the first and second walls respectively, • an outlet opening suitable for allowing a purified air flow (P) to flow out from the module into the purification chamber , characterized in that it comprises: - a heat exchanger arranged so as to receive air from the two inlet openings (8', 8") and let an air flow to flow out from the heat exchanger towards the purification chamber. - a box body comprising • a first and a second wall facing each other, at least one of said first and said second walls comprising a sheet made of a material transparent to light, • a pair of sidewalls each one connected to said first and second walls and suitable for closing said box body laterally, • a base and a lid each one connected to the pair of sidewalls and to the first and second walls to close said box body at the bottom and at the top respectively, • a purification chamber where a biofilter is arranged for purifying an input air flow (A) entering the module , • two inlet openings (8', 8") suitable for allowing the air flow that has to be purified to enter in the purification chamber , each one of said openings (8', 8") being formed in one of the first and second walls respectively, • an outlet opening suitable for allowing a purified air flow (P) to flow out from the module into the purification chamber , characterized in that it comprises: • a first and a second wall facing each other, at least one of said first and said second walls comprising a sheet made of a material transparent to light, • a pair of sidewalls each one connected to said first and second walls and suitable for closing said box body laterally, • a base and a lid each one connected to the pair of sidewalls and to the first and second walls to close said box body at the bottom and at the top respectively, • a purification chamber where a biofilter is arranged for purifying an input air flow (A) entering the module , • two inlet openings (8', 8") suitable for allowing the air flow that has to be purified to enter in the purification chamber , each one of said openings (8', 8") being formed in one of the first and second walls respectively, • an outlet opening suitable for allowing a purified air flow (P) to flow out from the module into the purification chamber , characterized in that it comprises: - a heat exchanger arranged so as to receive air from the two inlet openings (8', 8") and let an air flow to flow out from the heat exchanger towards the purification chamber. <EOS>