FIELD: agriculture, in particular, vegetable growing in protected ground. SUBSTANCE: block-type greenhouse has carcass with underframe girder 1, roof with drain troughs 4, ridges 5 and band-type air vents 6. Air vents 6 extend through the whole width of related roof slope and their mid portions are attached to shafts 7 under air vents. Shafts 7 are connected to drive 10 for pivoting each air vent 6 about shaft 7. Lower edge 8 of air vent 6 is supported by drain trough 4 and upper edge 9 is biased to ridge 5 from inner side of greenhouse. Number of sheds of underframe girder 1 is determined on the basis of air vent width and span of greenhouse by formula: 
, where n is number of sheds; Z is underframe girder span; 2 is number of shed slopes; l is air vent width; α is roof inclination angle. Shaft drive has chain drives. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 1 dwg
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