The labyrinth seal installed between the roof duct and the roof sheet guarantees watertightness. No additional sealing material is required. The self-supporting design renders supplementary suspension or bracing unnecessary. Roof sheets and external extension ducts are made of GRP and can be adapted on site. The roof sheet is available customised to the roof slope, roof profile, height above roof, colour of the roof and for side or ridge installation.

In addition to different standard roof sheet profiles, we can also provide customised profiles. The ridge-installed roof sheet is available as smooth version only. Assembly and disassembly are easily possible.

The air performance of the CL 920 is almost double that of the CL 600, which is why the CL 920 should be installed in barns with large exhaust air removal requirements. The suction head with integrated butterfly valve and the diffuser are made of polypropylene. The high-density polyurethane foam exhaust air duct consists of two half pipes, thus saving transport costs.

This structure ensures good insulation and prevents condensation water. The chimney is also easy to clean. Noises are significantly reduced as an additional advantage. The chimney can be connected to the roof by means of a roof sheet, similar to the CL 600, or by means of an economic, universal roof covering.

Up to 80 % increased working range of the chimney.

Only minimal decrease (approx 3 %) in exhaust air performance of the chimney.

No chimney extension required → no storm bracings, no unappealing outward appearance of the barn.

Economic alternative compared to chimney extension.

Quick and easy assembly.

BD exhaust air chimneys consist of 30 mm thick polyurethane pipes coated with smooth, glass-fibre reinforced polyester. This means that all BD chimneys are well-insulated, condensation water is prevented and noises are reduced.

The chimney pipes are delivered in halves (VC) and are assembled on site, thus saving transport costs. They are, however, also available as full pipes (AF). The chimney is closed off by a butterfly valve. Each chimney is delivered with the necessary fixing material. A roof sheet seals all chimneys.

The new chimney silencer is an innovation used to reduce noise emissions. The German Technical Inspection Association TÜV Nord measured a noise reduction of up to 12 dB(A) (for pipe diameters of 650, 730, 820 and 920 mm) in official tests. The total length of the silencer is 2.5 m.

Separation of animal area and exhaust air tower significantly improves hygienic conditions.

No leaking air because of idle fans.

No openings for unwanted leakage of rain water into the building.

No undesired incidence of light.

Thorough and simple cleaning of tower and chimneys with a high-pressure cleaner, separate from the barn.

Simple installation of the chimneys on the tower.

No problems with the static values of the roof.

No stability problems in case of strong wind.

The exhaust air principle MultiStep® combines stepless control and group control. The principle’s advantage is a significant reduction in energy consump­tion while the same air performance can be maintained: Compared to traditional negative-pressure systems, annual savings of up to 50 percent are possible.

Due to the steady, maximum exit speed of the exhaust air, unpleasant odours are significantly reduced. The entire venti­lation system is more pressure-resistant and less susceptible to wind.

The enhanced version of the well-proven MultiStep principle is called “Dynamic MultiStep”. This system works exclusively with the new ECblue fans that save even more energy. Instead of starting them at 100 percent speed, these fans begin working as early as at 30 percent (up to 50 percent depending on the required pressure resistance). Only after all fans have been started one after another at 30 percent is their speed increased simultaneously to 100 percent when the ventilation demand requires this.

Compared to the already very energy-efficient MultiStep solution, the power consumption of the new Dynamic MultiStep exhaust air principle is another 50 percent lower! The climate computer is responsible for controlling this system as well.

Very high energy-saving potential.

High efficiency in the entire speed range.

Universal activation via a 0-10 V analogue signal.

Pre-set ventilation level is precisely maintained due to the included speed feedback.

Very low noise level thanks to corrugated blade edges.

Easy and cost-efficient installation.

Very accurate recording of the air rate of exhaust air chimneys without any additional mechanical/moving components.

Reduction of heating costs thanks to precise minimum ventilation.

Suitable both for new buildings and for retrofitting (only in combination with the 135pro, 235pro and ViperTouch climate computers)

Long service life at a continuously high operational reliability.

Patent pending.