Duct elements

Filter boxes (cassettes) are HVAC elements used for air filtration in HVAC systems. Filter boxes (cassettes) are designed for HVAC ducts. The filter housings are made of galvanized sheet steel. The transported air must not contain particles that could cause damage to parts of the filters. The filter boxes (cassettes) are equipped with a door for the possibility to replace the filter cartridge. They standardly contain a G4 class filter or have no filter.

Filters are made of modern filter materials, which achieve high retention capacity of dust particles up to the standard pressure loss. The high retention capacity extends filter life and economy of HVAC equipment operation. The maximum utilization of the filtering surface is ensured by spacers in the individual filter pockets. Depending on the type of filter, the filter material is standardly embedded in a high-strength plastic or metal frame with wooden or metal separators or in other materials according to customer's requirements.

The HVAC dampers are a protective and basic regulating element of the HVAC duct systems. The dampers are available in several variants and designs - control (regulation) dampers, alternating dampers, throttle dampers, backdraft (non-return dampers, gravity louver shutters, hand-operated dampers, servo-controlled dampers, dampers for circular and four-sided ducts. As standard, we supply plastic or galvanized sheet metal dampers. We can supply some types made of stainless steel or aluminum on request.

The weather louvres are used primarily to protect the inlets and outlets of HVAC ducting. The weather louvres are also used as a functional architectural element with a large number of surface variants and especially colours (according to the RAL colour chart). Last but not least, the weather louvres are used to prevent a direct view of protected areas through openings in ducts or directly on the facades of residential, office or industrial buildings.

The PHZE acoustic louvres are used to attenuate the noise spreading through ventilation openings from areas exposed to noise into the external environment. The acoustic louvres are the most commonly used in engine rooms, compressor rooms and in similar noisy production areas. The acoustic louvre panels are filled with acoustically absorbent material with perforated sheet metal for maximum sound absorption. The acoustic louvres are standardly equipped with a net against insects and small animals.

Silencers for circular and four-sided ducts effectively attenuate the noise travelling through the ductwork. If higher attenuation is required, it is possible to use more silencers one after another. For the highest attenuation, place the silencer immediately behind a fan or a bend.

The flexible connectors serve to prevent the spread of vibrations and noise arising from the operation of fans or other machinery. The flexible connections are designed to be inserted between the vibration source and the air ducts. Their unique design ensures a perfect airtight and watertight connection of the ventilation ducts. Different design variants and sizes of the flexible connections allow use in any operating conditions.

The access doors are used for easier maintenance and cleaning of HVAC ducts. The access doors are available for circular ducts as well as for four-sided ducts. The access doors are made of galvanized steel sheet and are equipped with bolts for fixing to the HVAC ducts.

The condensate drain for circular ducts is used to drain the condensate that forms inside the duct. The condensate drain is made of plastic. Connection to the air duct by means of an internal NP/NPU coupling. The diameter of the drain hole is 20 mm.

Airflow controllers are designed for constant (CAV) or variable (VAV) airflow volume control in circular or four-sided HVAC ducts. Thanks to the regulation of air flow volume or duct pressure, the use of variable or constant air flow volume controllers is more economical for the operation of the HVAC systems. We supply air flow controllers for circular and four-sided ducts, from manually operated to electrically adjustable by servo drives.

Duct heaters are HVAC devices used for air heating in HVAC systems. Duct heater housings are made of galvanized sheet steel. Installation and placement of the electric air heaters must be unconditionally carried out in accordance with ČSN 33 2000-4-42 (IEC 364-4-42), where conditions are laid down in terms of protection against the effects of heat, fire, protection against burns and protection against overheating (including appropriate protective and safety circuits).

Duct coolers are HVAC components suitable for air cooling in HVAC systems and are designed for installation in circular ducts. The coolers are divided into two groups - water coolers and freon coolers. The cooler housings are made of galvanized sheet steel or zinc aluminium and the exchanger is made of copper tubes with aluminum plates.

The EKP droplet eliminators are designed for separation of condensed droplets from the air in ventilation and air conditioning systems. The droplet eliminators are most effective in the air flow behind a cooler or a heat recovery unitand are designed for direct mounting in four-sided ducts. The casing of the droplet eliminator is made of galvanized sheet metal with insulation against humidity condensation. The droplet eliminators are supplied in a left (L) or right (P) version when viewed in the direction of air flow and are equipped with an insulated condensate drain. The droplet eliminators can only be installed in a position that allows condensate to drain (basin down). The separated air must not contain fibrous, solid, sticky or aggressive admixtures. The air must not contain chemicals that cause corrosion or damage zinc. We recommend making the connections to the ducts watertight.

The inlet cones are designed for duct and roof fans and are located on the suction side. The dimensions of the inlet cones correspond to the flanges of the duct fans of the respective manufacturers. The inlet cones are made of galvanized sheet metal and serve to direct the suction air and thus reduce the generated noise.

The HVAC protective grilles are most often used to protect a fan against an ingress of foreign bodies, but also to terminate the ventilation ducts, or directly for the installation on the suction or discharge of the fan. Our range of protective grilles usually includes grilles standardized by the manufacturers for specific fans. The protective grilles are designed for both circular and four-sided ducts.

Circular flanges for HVAC installations are used in systems where smooth connections of spiro-ducts are required. The circular flanges are used to connect spiro-ducts when not only clean air is transported through the ducts. The circular flanges are pressed.

The plenum boxes are recommended accessories of distribution elements such as diffusers and are used for both air supply and exhaust. Diffusers with plenum boxes adjust pressure losses, reduce noise levels, balance ventilation systems and enable air flow measurement. They are made of galvanized sheet steel and are equipped with noise insulation on the inside.

In this category you will find recommended accessories of manufacturers for roof fans. The range includes non-return dampers, flexible connections, bases / extensions, connection adapters, frames and flanges.