A heat exchanger comprising; • a core comprising: o sets of tubular elements (112a, 112b) in fluid communication with a first pair of inlet and outlet to define first fluid flow there-though; o a plurality of fluid flow passages receiving fins therein are in fluid communication with a second pair of inlet and outlet to define second fluid flow there-though, the fluid flow passages are adapted to sandwich at least one set of tubular elements (112a, 112b); • a housing comprising a first portion and a second portion adapted to be assembled to form an enclosure and receive the core therein to define an assembled configuration of the core and the housing, the housing comprising a plurality of ribs adapted to extend from at least one of a first face and a second face of the housing respectively towards the core received in the housing, characterized in that the ribs extending from at least one of the first face and the second face comprising extended ribs and respectively adapted to limit fluid flow through gap between the core received in the housing and at least one of the respective first face and the second face in the assembled configuration, at least one first fin and at least one second fin disposed in respective first and second fluid flow passages and at extreme ends of the core adapted to be deformed to at least partially disrupt fluid flow through the respective first and second fluid flow passages and. • a core comprising: o sets of tubular elements (112a, 112b) in fluid communication with a first pair of inlet and outlet to define first fluid flow there-though; o a plurality of fluid flow passages receiving fins therein are in fluid communication with a second pair of inlet and outlet to define second fluid flow there-though, the fluid flow passages are adapted to sandwich at least one set of tubular elements (112a, 112b); o sets of tubular elements (112a, 112b) in fluid communication with a first pair of inlet and outlet to define first fluid flow there-though; o a plurality of fluid flow passages receiving fins therein are in fluid communication with a second pair of inlet and outlet to define second fluid flow there-though, the fluid flow passages are adapted to sandwich at least one set of tubular elements (112a, 112b); • a housing comprising a first portion and a second portion adapted to be assembled to form an enclosure and receive the core therein to define an assembled configuration of the core and the housing, the housing comprising a plurality of ribs adapted to extend from at least one of a first face and a second face of the housing respectively towards the core received in the housing, characterized in that the ribs extending from at least one of the first face and the second face comprising extended ribs and respectively adapted to limit fluid flow through gap between the core received in the housing and at least one of the respective first face and the second face in the assembled configuration, at least one first fin and at least one second fin disposed in respective first and second fluid flow passages and at extreme ends of the core adapted to be deformed to at least partially disrupt fluid flow through the respective first and second fluid flow passages and.