A shrink tunnel with an apparatus for temperature control of a fluid flow, which is formed by air and/or gas, by way of bringing together the fluid flow formed by air and/or gas with a hot gas volume flow, the shrink tunnel comprising - at least one machine for generating the hot gas volume flow; - a channel, which provides a flow path for the fluid flow formed by air and/or gas; - a feeder device positioned at least with some sections in the flow path, which feeder device, for the purpose of introducing the hot gas volume flow into the channel, is in flow connection with the at least one machine and the channel; - wherein the feeder device, for the purpose of introducing the hot gas volume flow into the channel, has a plurality of openings positioned in the area of the flow path, of which plurality of openings at least two openings are located at different vertical height levels; and wherein it is provided that - the feeder device comprises a plurality of adjacent hollow bodies extending into the channel and being in flow connection with the at least one machine for the purpose of receiving the hot gas volume flow, with the hollow bodies forming the at least two openings located at different vertical height levels and having two broadside surfaces (21, 23) located opposite each other and extending along the flow path; and wherein - the broadside surfaces (21, 23) of the plurality of adjacent hollow bodies are oriented parallel to each other, and wherein at least two openings located at different vertical height levels are in each instance introduced into at least one of each of the two broadside surfaces (21, 23) of the plurality of adjacent hollow bodies, with the broadside surfaces (21, 23) being located opposite each other; and wherein the plurality of hollow bodies of the feeder device are each designed to be cube-shaped and each have an approximately identical volume, together form a roof of a surface size A1, together form a surface area extension transverse to the flow path of a size A2, and each have broadside surfaces (21, 23) located opposite each other, each of an identical surface size A3, wherein the following applies: A1 > A2 > A3. - at least one machine for generating the hot gas volume flow; - a channel, which provides a flow path for the fluid flow formed by air and/or gas; - a feeder device positioned at least with some sections in the flow path, which feeder device, for the purpose of introducing the hot gas volume flow into the channel, is in flow connection with the at least one machine and the channel; - wherein the feeder device, for the purpose of introducing the hot gas volume flow into the channel, has a plurality of openings positioned in the area of the flow path, of which plurality of openings at least two openings are located at different vertical height levels; and wherein it is provided that - the feeder device comprises a plurality of adjacent hollow bodies extending into the channel and being in flow connection with the at least one machine for the purpose of receiving the hot gas volume flow, with the hollow bodies forming the at least two openings located at different vertical height levels and having two broadside surfaces (21, 23) located opposite each other and extending along the flow path; and wherein - the broadside surfaces (21, 23) of the plurality of adjacent hollow bodies are oriented parallel to each other, and wherein at least two openings located at different vertical height levels are in each instance introduced into at least one of each of the two broadside surfaces (21, 23) of the plurality of adjacent hollow bodies, with the broadside surfaces (21, 23) being located opposite each other; and wherein