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Lots for little animals try to get a way into the house through the cellar or the air shaft. 
Heinzmann air shaft coverings refuses this entrance without affecting the air circulation.

aluminium frames E6EV1 natural anoded for additional installation. 

advantages overview:   exactly-measured production   weather-proof   high light and air transmission   high durability (no oxidationt)   easy to clean   rounded profiles only 7 mm height   environmentally favourable materials (high-grade steel and aluminum) available: ISL 901: standard (first picture) ISL 902: coupled standard with rectangle coupling (second picture)