12 with ventilation openings 7 and batten pocket 55 a detailed view of batten pocket 55 is shown in fig8 with the opening 52 within batten pocket 55 filled by plastic tube 51 a side sectional view of tube 12 in fig9 highlights the opening 60 at the top central portion of tube 12 in the embodiment of the opening section shown in fig1 one side of the batten pocket 55 is finished with a straight end 53 while the other side 58 is finished with a folding corner to facilitate entry of the support member such as plastic tube 51 within the pocket the top central portion and folding corner may be fitted with hook and loop fastening material to secure the plastic tube 51 in the pocket space 52 fig1 illustrates a commercial embodiment of fabric tube 12 with ventilation tube opening 7 and batten pockets 55 the support straps 14 extend upward from the top center portion of the tube to suspension line 34 suspension line 34 is in turn supported by guide rail 70 the batten pocket 55 is advantageously performed by simply sewing or otherwise fastening a strip of cloth 50 around the outside of the diameter of the fabric duct work to form a pouch 52 that is preferably accessible from the top center portion 32 of the fabric duct.