Air collectors can be found in systems for heating or pre-heating of the ventilated air in buildings (Fig. 3). All-polymeric solar air collectors or

collectors with polymeric collector components are found in the market as small stand-alone units for dehumidification of week-end houses, cabins, garages, storerooms, etc. and for heating of large industrial buildings and residences. An example, which obviously includes the advan­tages of using polymers for solar collectors is shown in Fig. 3 and Fig. 8 (d): A modular roof­ing system of building integrated air collectors, which replaces conventional roof cladding and contributes to space heating.