Standard ventilators are made of plastic, a large size in ventilators allowing a high degree of ventilation. They are constructed in the form of an inclined curtain that prevents birds from building nests.

Technical data:
- dimensions: 43 x 45 x 11 cm,
- ventilation area: 322 cm / pc,
- color: black, brown,
- purpose: all shingles,
- has all the documents permitting use.