A configurable convective device (100, 200, 300A, 300L), comprising: a flexible first layer (107, 207, 307A, 307L) having air permeable surface; a flexible second layer joining the first layer by a periphery seal (106, 206, 306A, 306L) around a common periphery to form a pneumatic structure (140, 240, 340A, 340L), the pneumatic structure having a first edge (141, 241, 341A, 341L) and an opposing second edge (142, 242, 342A, 342L), wherein the pneumatic structure comprises a first portion (143, 243, 343A, 343L), a second portion (144, 244, 344A, 344L), and an inflatable channel (145, 245, 345A, 345L) connecting the first portion and the second portion, wherein the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L) define a plane; at least one opening (130, 230, 330A, 330L) into the pneumatic structure; and an air-guide device (120, 220, 320A, 320L) disposed proximate to a periphery of the inflatable channel (145, 245, 345A, 345L) connecting the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L), the air-guide device (120, 220, 320, 320L) configured to direct flow of inflation medium by facilitating forming creases at the edge of the air-guide device to reduce kinking effects and air pressure drop when the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L) are bent with respect to each other within the plane, wherein the air-guide device (120, 220, 320A, 320L) comprises two guiding seals (121, 122, 221, 222, 321A, 322A, 321L, 322L), each guiding seal extending from the periphery seal (106, 206, 306A, 306L) proximate to the second edge (142, 242, 342A, 342L) and toward the pneumatic structure (140, 240, 340A, 340L), wherein the two guiding seals (121, 122, 221, 222, 321A, 322A, 321L, 322L) are directed to the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L), respectively, of the pneumatic structure (140, 240, 340A, 340L). a flexible first layer (107, 207, 307A, 307L) having air permeable surface; a flexible second layer joining the first layer by a periphery seal (106, 206, 306A, 306L) around a common periphery to form a pneumatic structure (140, 240, 340A, 340L), the pneumatic structure having a first edge (141, 241, 341A, 341L) and an opposing second edge (142, 242, 342A, 342L), wherein the pneumatic structure comprises a first portion (143, 243, 343A, 343L), a second portion (144, 244, 344A, 344L), and an inflatable channel (145, 245, 345A, 345L) connecting the first portion and the second portion, wherein the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L) define a plane; at least one opening (130, 230, 330A, 330L) into the pneumatic structure; and an air-guide device (120, 220, 320A, 320L) disposed proximate to a periphery of the inflatable channel (145, 245, 345A, 345L) connecting the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L), the air-guide device (120, 220, 320, 320L) configured to direct flow of inflation medium by facilitating forming creases at the edge of the air-guide device to reduce kinking effects and air pressure drop when the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L) are bent with respect to each other within the plane, wherein the air-guide device (120, 220, 320A, 320L) comprises two guiding seals (121, 122, 221, 222, 321A, 322A, 321L, 322L), each guiding seal extending from the periphery seal (106, 206, 306A, 306L) proximate to the second edge (142, 242, 342A, 342L) and toward the pneumatic structure (140, 240, 340A, 340L), wherein the two guiding seals (121, 122, 221, 222, 321A, 322A, 321L, 322L) are directed to the first portion (143, 243, 343A, 343L) and the second portion (144, 244, 344A, 344L), respectively, of the pneumatic structure (140, 240, 340A, 340L).