We often face a requirement of cooling and heating using one system. However, the way of distribution of air must be completely different for both regimes to provide effective heating and draught-free cooling. This contradictory requirements can be resolved using a membrane diffuser that is divided horizontally in the centre using thin impermeable textile - membrane. This membrane can cover (and thus put out of operation) the upper or lower longitudinal half of the diffuser. The upper part is designed to diffuse air, the lower part is designed to direct high-speed air flow downwards. The delivery also includes a special flap with a servomotor that allows switching over between both regimes of air distribution.

Two kinds of diffuser are combined in one product. A membrane, which is made of flimsy impermeable fabric, is sewed horizontally in the centre of a diffuser. The beginning of the membrane is attached to a flap controlled by a servomotor. It covers either the top or the bottom half of the diffuser. While heating, the membrane covers the top half of the diffuser and the air is diffusing through the row of openings ownwards. The membrane covers the bottom half of the diffuser and the air is diffusing upwardly through permeable fabric / fabric modified by means of microperforation while air-cooling. The input velocity must not be higher than 7 m/s, the velocity in eventual branches must not be higher than 5 m/s. Two kinds of diffuser are combined in one product. A membrane, which is made of flimsy impermeable fabric, is sewed horizontally in the centre of a diffuser. The beginning of the membrane is attached to a flap controlled by a servomotor. It covers either the top or the bottom half of the diffuser. While heating, the membrane covers the top half of the diffuser and the air is diffusing through the row of openings ownwards. The membrane covers the bottom half of the diffuser and the air is diffusing upwardly through permeable fabric / fabric modified by means of microperforation while air-cooling.