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Topic : HVAC in construction
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HVAC & Refrigeration

 
Created by : KAMLESH HARHARE, MEP CONSULTANT, ARCHGROUP CONSULTANT  | 09 23 2009 19:44:19 +0000
Industry : ConstructionFunctional Area : HVAC(Others)
Keywords : ducting
Activity:  1839 views;  last activity : 07 19 2011 06:38:51 +0000

Now a days Pre insulated ducting,  the latest technological processes is becoming popular for HVAC industry as it is installed in single fix , eliminating the need for second fix which saves significant time and cost. It is made up of a rigid close cell polysocianate board / rigid phenolic insulated panels faced by an aluminium foil on both the side.

Which ducting is better Pre Insulated OR Conventional GI Ducting

 
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PRE INSULATED DUCTING Vs GI DUCTING
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It depends on the nature of application to prefer Pre-insulated duct or GI. Except commercial offices and other such applications, where internal layout is subjected to frequent changes, GI is always a better option.


By Anwar Quadri, Mechanical Engineer Poyry Energy Limited Dubai  02 01 2010 16:04:30 +0000
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The Aluminum Pre-insulated duct is the ideal duct for any application, as it has so many advantages compared to the traditional GI duct:

- Durability – NO rust, NO oxidation at all; it can easily last for more than 30 years

- Best Insulation – even thickness all around the duct and durable performances

- It can stand up to 5.000 Pascal pressure - Air Leakage: Class C up to 500 Pascal, then Class B (this just with the standard fabrication…)

- It is lighter than the GI duct

- Can be indifferently installed Indoor or Outdoor; no extra cladding is required…

Regarding the damages during the installation, you can have ducts with 0,2 mm or 0,5 mm external aluminum foil; these ducts cannot be damaged so easily.

Regarding the fire, some pre-insulated ducts have been certified and approved to be installed inside the buildings, even in Hotels and Hospitals. According to statistics, most of the fires start in the room, where more burnable and poisoning materials are present; the moment the fire reaches the ducts, melts aluminum and start burning a small 20 mm of foam the building should be already evacuated… I would not miss the opportunity to take the benefits of Pre-insulated Ducts just because of this small worry about fire…

At the end, the point is to select the right product and a professional Pre-Insulated Duct Manufacturer.


By MARCO PESCALI, Marketing & Sales Director, ALP ITALY  | 07 19 2011 06:38:51 +0000
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No doubt pre-insulated duct has higher side in comparison with GI duct in many features ( either technical side or financial side) but  it gives poisonous (cyanide)gas when got fire. So most of the people die due to this gas occurred during accident by pre-insulated duct.I can remember one fire accident of a tower in Dubai & people died due to the poisonous gas occurred by PI duct.


By Mohammed Danish Rasheed, Sr.Mechanical Engineer-HVAC, Plumbing, Fire-Fighting, Mustang HDP  | 05 30 2010 08:46:42 +0000
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As Pre Insulated Ducting  has the limitation such as :

1. It can not be used for higher static applications.

2. Life of the ducting is limited.

3. Fire Rating

4. Leakage 

5. Prone to damage during installation

I will support to Conventional GI Ducting.


By KAMLESH HARHARE, MEP CONSULTANT, ARCHGROUP CONSULTANT  | 09 23 2009 19:46:42 +0000
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