Specifications:
The document describes ventilation chimneys under the ILK brand, available in single or double wall configurations, made entirely of HDPE. These chimneys are impact and UV-resistant, and come in a compact version with an 80% volume reduction. Various roof profiles are available.

Dimensions and Capacities:
- Internal diameters range from 370 mm to 920 mm.
- Chimney lengths are available in 1000 mm, 1200 mm, and 1500 mm.
- Capacity varies by diameter and pressure:
   - ILK 645: 645 mm diameter, 4100 m3/hr at 10 Pa, 5400 m3/hr at 20 Pa.
   - ILK 730: 730 mm diameter, 5250 m3/hr at 10 Pa, 6900 m3/hr at 20 Pa.
   - ILK 820: 820 mm diameter, 6600 m3/hr at 10 Pa, 8700 m3/hr at 20 Pa.
   - ILK 920: 920 mm diameter, 8300 m3/hr at 10 Pa, 11000 m3/hr at 20 Pa.

Suitable Sectors:
The chimneys are suitable for use in sectors involving calves, pigs, and poultry.

Options and Accessories:
- Chimney with rain cap
- Bird wire around cap supports
- Distribution plate
- Winch kit for distribution plate
- Perforated tube
- Damper
- Outflow ring
- T-piece, elbow, etc.