Fundamental Characteristics of Fire Rated Ductwork

Fire rated ductwork usually needs to pass through compartment walls or floors that will have a prescribed fire resistance period in terms of the load-bearing capacity, integrity and insulation criteria, for durations of 30 to 240 minutes. It is a requirement that where these compartment walls/floors are penetrated by HVAC ducts or other building services, the fire performance criteria for the penetrated wall or floor are maintained, such that fire in one compartment may not spread to other areas. So, the fire-resisting duct needs to maintain i.e., not compromise the fire resistance of the wall or floor through which it penetrates. The performance of a fire-resisting duct which penetrates a fire resisting/separating element requires careful consideration by specifiers and controlling authorities. The standard periods of stability and integrity should in all cases be at least equal to those required for the penetrated element of construction. – Blue book

The methods followed for the fire resistance of walls and floors penetrated by ventilation HVAC ducts in building regulatory requirements and under the guidance of BS 9999:

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• The frame and blades are of high quality extruded aluminium profiled construction with the advantages of corrosion resistance and rigidity.
• Louvered type core or  is fixed to the frame with aluminium pins loaded with steel springs. Core can be easily removable and interchangeable to allow for maximum flexibility in installation, maintenance and damper adjustment.
• Damper is fixed rigidly to the frame by aluminium rivets. Fixing by spring clips as option.
• Damper blades are separated from its frame by nylon bushes.
• Opposed blade damper is screw operated from the face opening of the diffuser after removing the internal core. Lever operated damper as option.
• Foam gasket is sealed around the back of the frame as option to avoid air leakage.
• Suitable for flush mounting in lay in type ceiling.
• Stamped frame and core available.
• Available in rectangular sizes as option.
• One , two and three way discharge pattern arrangement shown below.

Optional Accessories

• Damper
• Equalizing Grid
• Filter
• Plenum Box
• Adapter with round or square neck

Available Air patterns :
        
                     4-WAY THROW                                             3-WAY THROW                              2 WAY CORNER THROW 
            
             2 WAY SIDE THROW                                              1 WAY THROW

Air pattern	Square	Rectangular
One way
Two way
Two way corner
Three way
Four way

Standard sizes:

• Available in square and rectangular sizes.
• Any combination of W x D.

False ceiling sizes:

Fixing details:

Concealed screw fixing from neck of the diffuser to the duct, after removing the inner core.

Square Diffusers Product Summary:

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• Structure is robustly designed and constructed with face bars positioned in the frame to withstand heavy loads.

• Face bars with zero degree deflection is assembled and supported by heavy duty
  SS rod. The assembled core is removable to enable inspection, cleaning and maintenance.
• Flush type construction enables easy installation and gives even finish with the floor levels.
• Fixed core assembly is also available wherein the core is welded to the frame. The frame can be connected to the plenum or support frames using screws.
• Standard Sizes available are 600 mm x 600 mm for tile replacement. Custom sizes available on request according to corresponding floor levels and plenum depths.

Application : Computer/Server room, telecommunication, food industry, hospitals, Oil and gas industry, Airports, Gymnasiums, kitchen and public areas.
Standard finishes:

• Standard SS finish, polished or brush finish.

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• Pressure relief dampers are provided with weighed metal strip.
• Dampers are tested after fabrication to operate at required pressure
• The dampers are designed to maintain a constant pressure level inside pressurized room by relieving excess air when it exceeds the desired limit.

Standard Finishes:

• Powder coated as per RAL colour codes.

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• Composed of frame and horizontal blade assembly made of high quality extruded aluminium profile with the advantages of durability and corrosion resistance.
• Exhaust air louver Designed to have sturdy construction. Blades are fixed to the main frame using screws and riveted to the mullions for bigger sizes.
• Weather resistant structure with blades inclined at an angle of 45^o to protect against rain water penetration.
• Assembly provides around 45% effective pressure area.
• Multiple sections will be assembled as per request.

Standard Finishes:

• Natural anodized aluminium finish.
• Epoxy powder coated finish. Color as per clients’ choice.

Options:

• Flange width: 12, 16, 24mm flange widths are optional
• Mesh :
  • 12 x 12 x 1.5mm dia aluminium PVC coated wire mesh
  • 12 x 12 x 1mm dia G.I wire mesh
  • S Mesh
• Insect Screen
• Filter thickness: 12mm or 45mm

Optional Frame and Blade: 2mm thick profile is available for heavy duty application

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• Composed of frame and horizontal blade assembly made of high quality extruded aluminium profile with the advantages of durability and corrosion resistance.
• Designed to have sturdy construction. Blades are fixed to the main frame using screws and riveted to the mullions for bigger sizes.
• Louver is fixed with a removable/washable filter with aluminium mesh as the filter media.
• Weather resistant structure with blades inclined at an angle of 45^o to protect against rain water penetration.
• Assembly provides around 45% effective pressure area.
• Multiple sections will be assembled as per request.

Standard Finishes:

• Natural anodized aluminium finish.
• Epoxy powder coated finish. Color as per clients’ choice.

Options:

• Flange width: 12, 16, 24mm flange widths are optional
• Mesh :
  • 12 x 12 x 1.5mm dia aluminium PVC coated wire mesh
  • 12 x 12 x 1mm dia G.I wire mesh
  • S Mesh
• Insect Screen
• Filter thickness: 12mm or 45mm

Optional Frame and Blade: 2mm thick profile is available for heavy duty application

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• Airmaster eye ball jet diffusers are suitable for delivering a powerful stream of air over long distances
• Ideal for spot cooling applications
• Fully reversible spout with 180 degrees rotation
• Diffuser can be fixed directly to the round duct
• Jet nozzle section is mounted in aluminium square plate covered by flanged border.

Standard finishes:

• Powder coated color finish as per RAL color codes.
• Flexibility of finishing available as option.

Standard Sizes: 

Panel arrangement:
1, 2, 3 or 4 nos of jet diffusers will be arranged in a panel as per performance requirement.
 

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• Sound Attenuators – Crosstalk has aerodynamic design to ensure maximum insertion loss and minimal pressure drop. Air-
  gap and length of silencer are selected to meet the required NC level.
• Crosstalk silencer is primarily used to reduce the noise interference between interconnected rooms while maintaining the smooth airflow with acceptable pressure drop level.
• Sturdy construction and high noise absorbing capacity to obtain required insertion loss without compromising performance . Manufactured to ensure long and maintenance free service.
• Splitters are radiused at both ends to minimize self generated noise and pressure loss.
• Casing construction with lock formed seams meet SMACNA standards thus providing excellent strength and rigidity . Thoroughly sealed to prevent air leakage.
• Duct mate flange connection (standard) on both ends in compliance with DW144 standards.
• Acoustic infill media is of superior quality non combustible & have fungi resistant characteristics meeting the requirements of EN ISO 1182 and ASTM C665 respectively. It has excellent noise reduction coefficient characteristics with an additional qualification of being biologically inert.
• Sound Attenuators – Crosstalk tested and certified by Intertek USA (NVLAP accredited laboratories) in accordance with ASTM standard E477-06a ,entitled “standard method of testing duct line material and prefabricated silencers for acoustical and airflow performance”.

ACT Dimensional Details


Options Available Upon Request (Non Standard)

• Flange : M.S angle frame
• Flange width : 30mm or 40mm
• Media : Fiber glass woven glass fabric as line
• Casing Material: Stainless steel or Aluminium.

Product Summary:
Model : ACT
Product Description: Cross Talk Silencer
Installation Guide:

• Do not place the silencer immediately after the noise source like air handler or blower in order to allow uniform flow profile to develop. Leave at least 2-5 duct diameters in the upstream and downstream of the silencer for better silencer efficiency.
• Do not expose the silencer to dirt or excess humidity while installation or during storage.
• The HVAC system should be designed meticulously for proper dehumidification and air- filtration to prevent microbial growth within the silencer and the duct system.
• It is recommended to install the silencer after the volume control damper to prevent regenerated noise.

Product Order Checklist:

• Required room sound criteria.
• Airflow data for each silencer
• Duct size and maximum length available for silencer to fit in.
• Details of the air-handling units with its noise levels.
• CAD drawings with clear details of duct routing from each unit and duct- size till the first air outlet.

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