inner surface of each of the members the side members 12 18 the top 20 and the bottom 22 secure over and about a plurality of frame members 25a 25n a plurality of access doors 26a 26n are disposed along side member 12 for access to a plurality of opposing aligned upper air bars 28a 28n and lower air bars 30a 30n mounted in upper frame pairs 32 34 and lower frame pairs 36 38 respectively a web passes between the pluralities of upper and lower air bars 28a 28n and 30a 30n respectively for drying of the passing web and enters and exits the dryer enclosure 11 at slots 29 and 31 on the enclosure sides a quieting chamber 33 secures over the entry slot 29 an upper air supply header 40 and a lower air supply header 4 provides heated drying air to the respective upper and lower air bars 28a 28n and 30a 30n the upper and lower air supply headers 40 and 42 are hydraulically positioned with respect to the upper and lower air bars 28a 28n and 30a 30n in enclosures 132 and 134 illustrated in fig4 a lower supply duct 46 illustrated in fig2 and 3 aligns below an upper.