Review article

In the systems of natural and mechanical exhaust ventilation installed in residential, public, office and household buildings, ventilation units, including composite ventilation units, are used as air ducts. Satellite duct is connected with ventilation unit collection duct on the floor located above it (through an air lock). The collection duct must be produced corresponding to the leakage class B specifications. There has been developed an apparatus for carrying out the airtightness test for assessing the airtightness of claydite-concrete composite ventilation units “Polygran” manufactured by method of by semi-dry vibration pressing.There were studied two variants of ventilation units’ setting on a 3-meter high floor: one using sand-concrete masonry mortar and the other using adhesive mixture “Polygran” with smoothing of outer surface with sand-concrete mortar or adhesive mixture application on the outer side.