Příhoda

Possibilities, Details, Specialties

Membrane Diffuser - Diffuser for two different supply air modes
This combines two types of diffuser into one. The membrane flap is a lightweight non permeable material sewn all along the duct length.  The membrane is attached to a two position motor.  In heating mode the motor moves the membrane to cover the cooling diffusers located at the top of the duct, the supply air exits the heating perforations on the bottom of the duct. In cooling mode the motor moves the membrane to cover the heating perforations at the bottom of the duct and the cool supply air leaves the perforations at the top of the duct.  The membrane allows two totally different diffusion styles in one duct.
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Negative Pressure (Extract) Ducting - Fabric Ducting for removing air

We supply these only in square or triangular cross-sections. Because taught fabric is essential for extract ducting we tension the walls using a combination of suspension profiles, tensioning bolts and threaded bar. Air is drawn into the duct through perforations that can be positioned on any side and anywhere along the length of the duct. To ensure equal extract rates we can adjust the perforation diameters or the gaps between the perforations progressively along the duct. We anticipate our negative pressure ducts will be used where regular and/or thorough cleaning is required. Negative pressure fabric ducting is easily disassembled from the suspension system and unzipped into smaller washable parts. If PMI or NMI material is used, the ducting will have both flame retardant and antibacterial properties (impregnated silver).
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Insulated Ducting - Thermal insulation and noise dampener
Used for decreasing temperature loss during transfer of conditioned air to the diffusers. A 40mm thick, loose fibre, insulating polyester material is sewn between two layers of fabric ducting material.  All of our fabric ducting materials are available for use as the outer layer of the insulated duct allowing an easy match with other parts of the system. The manufacturing process compresses the original 40mm loose insulation layer by 20mm, reducing the finished product wall thickness. The maximum duct heat transfer coefficient is 1.5 W/m2/K. Insulated duct is manufactured as standard in 2000mm zipped lengths and starts from Ø250mm upwards.  Insulated ducting also acts as an excellent noise dampener, absorbing and reducing in duct noise vibration, contact us for specific details.

Adjustable Length Fabric Duct - Option of changing the duct length during assembly
Eight adjustable tie belts are sewn along the length of the circular duct.
By adjusting (tightening or loosening) all eight belts, we can manually adjust the duct length to suit the installation requirements.

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Adjustable Bend - Bend angle may be adjusted during assembly
Eight adjustable tie belts (same as in adjustable length) are sewn along the length  of the circular duct.
Shortening a particular belt turns the bend in that direction.  The final bend angle is achieved by adjusting the belts on certain sides of the duct to their appropriate lengths.

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Small Nozzles - For directed air patterns and long airflow distance
Small nozzles allow directed air patterns. Airflow is extended by circa 25% in comparison to standard perforations and deflection minimized. The small nozzles exist in three diameters 20, 30 and 40 mm and in two variants, industrial and premium.
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Big Nozzles - For Maximum airthrow distances
Our big nozzles (larger diameter) allow the longest airthrow distances. Range can exceed 20m depending upon static pressure and temperature difference. Nozzles can be fixed, adjustable or directed. Each of the nozzles has a very similar visual design; the adjustable nozzle may be directed as desired up to ± 45° using four belts which are hidden beneath an aesthetic fabric hem. An adjustable damper is sewn into every nozzle to allow variable flows.
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Fixed nozzle

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Adjustable nozzle


Directed nozzle


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Tensioners - Significantly improve appearance

Screw tensioners slide into the profile are used to remove wrinkles and creases in the fabric. The flexibility of the fabric allows it to stretch by up to 0.5%. Pre-stretched diffusers are therefore manufactured 0.5% shorter than specified and the true length is achieved when tensioning. The installation procedure is specified in the assembly instructions included in all deliveries.


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End Tensioning
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anchored into the wall in the axis of the diffuser
anchored into the wall or ceiling




Internal tensioning system
The Internal Tensioning system is designed to maintain the shape of the duct with or without supply air.  It consists of tensioning sections (Consoles) and shaped rings.  Turning the axial thread of the Console tensioning ring stretches and tensions the duct.
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Reinforcing Components - Maintaining the shape of circular ductin

Used to retain the shape of uninflated circular ducts.

Tyres/Rings



Manufactured from fire resistant plastic (for diameters ≥ 400 mm), from stainless steel wire, or from flat aluminium profiles. They are installed internally or externally with a standard spacing of 500 mm, the rings are fastened with Velcro and can be removed for maintenance.

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Inflated diffuser with tyres/rings


Diffuser with tyres without air supply

Arcs



Used for improving uninflated diffuser shapes. The ends of the Arcs are inserted into pockets sewn on to the internal ducting wall, they also have a central velco fastening. Arcs can be easily removed for maintenance. Arcs are a lower cost alternative to tyres/rings.

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Inflated diffuser with arcs


Uninflated diffuser with arcs


Equalisers - Airflow turbulence reduction

Equalisers are used downstream of the supply fan or inlet spigot. Their function is to reduce air turbulence and duct movement, however their use must be planned as they increase pressure drop.

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EQ - perforated fabric cone
EQS (star) - shaped fabric sewn into the diffuser
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EQP (pot) - cylinder sewn from a perforated fabric with bottom
EQT (T-shape) - cylinder sewn from a sieve with bottom




Adjustable Perforation - Setting airflow
Our original innovation allows for manual adjustment of the diffuser hole size and airflow. The pictures below describe the operation - actual diffuser sizes and hole patterns are completely variable depending upon the project requirements.  The chosen position is retained using velcro.
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Damper - Equalising static pressure within a duct

The Damper is a short cone made of perforated fabric.The inlet of the damper is normal duct diameter whilst the outlet can be adjusted to a smaller diameter, by use of an adjustable belt. Maximum opening of the damper outlet results in zero pressure loss, whilst fully closing the outlet provides the highest local pressure drop. The damper setting can be adjusted at any time by opening a zip on the duct circumference. By Installing a damper part way along the duct one can equalise the static pressure within the duct and therefore the air flowing from each point along the duct. We also use dampers to provide flow control through Fabric Nozzles and outlet spigots to other parts of a system.


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Antistatic design - Removal of electrical energy build up

Antistatic design is intended for rooms, where a build up or uncontrolled discharge of static electricity must be avoided.

Our Antistatic system consists of 4 measures:
1. A conductive fabric (PMI and NMI conform as we add a conductive weave)

2. A highly conductive strip installed all along the length of the duct

3. All zippers are equipped with metal joints



Diffuser for Intensive Cooling - For cooling with a high temperature difference

For cooling applications with a ∆t ≥ 6° k we recommend using horizontal air patterns from the Fabric Duct. This can be achieved by placing the micro-perforations in a band on either side of the duct at 90° and 270°. The horizontal airflow pattern must achieve a specific speed in order to prevent premature downward deflection. With sufficient outlet speed (provided by static pressure) it is possible to introduce 1 kW of cooling capacity per 1 m duct length, whilst maintaining a velocity below 0,2 m/s in the occupied zone. The air flow patterns are detailed in the illustrations below, please contact our authorized representatives for specific applications.



Air Diffuser LanternSimple setting and directing of airflow

Our Lantern diffuser is designed to distribute air at high level, most often from units installed on the roof. It may only be installed in a vertical position. The air is blown horizontally in one to six directions. Vertical sliding strips are used to regulate the flow rate.



Defrost Damper - Faster and more efficient cooler defrosting

The Defrost Damper (DeDa) collapses over the evaporator fan face, blocking off the front of the cooler, this stops unwanted fan rotation and speeds up the process of defrosting.

 

 

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Winch - For installing & removing Fabric Duct at one end

The whole Fabric Duct can be installed from one end of the installation using a Prihoda winch. This significantly simplifies installation and removal. This system is particularly useful where the fabric ducts are mounted over swimming pools or technical machinery where access is limited.

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