Pre-insulated Ducts

Pre-insulated ducts are the latest technology and the best replacement for traditional galvanized and aluminum ducts. Nowadays, these kinds of ducts are mainly used in most European, American, and Persian Gulf coastal countries which are made of 80-micron thick aluminum foil sheets on both sides and 20mm thick polyisocyanurate foam (PIR) with 0.018 W/(m2K) heat transfer coefficient in size of 4 to 1.2m. Furthermore, the manufacturing and production of these products are obtained by PIR panels’ cutting and forming to duct, three-way converters, and also manufacturing through H Bayonet, U profiles and plastic, and steel corners.

Application

It is highly recommended to use these kinds of ducts in areas with high humidity because aluminum coating brings about a moisture-resistant structure. The telescopic structure of galvanized ducts achieved by hammering the sheets is the main cause of corrosion and accumulation of iron oxide. On the other hand, fiberglass insulation is mostly utilized to insulate these kinds of ducts which have been proven harmful to human health due to the carcinogenic particles which pass through the duct and enter the ventilated environment. Pre-insulated sheets have the minimum risk of abrasion and rust because of aluminum coating.

These kinds of ducts are the best choice for sensitive environments owing to the airtightness obtained by adhesives and special joints utilized after the cutting. In addition, the implementation speed of galvanized ducts is not as fast as pre-insulated ones and would be a time-consuming process which would be considered as a key factor in most of the projects.

Installation

First, the 4 to 1.2m pre-insulated panels are directly sent to the project site, and then based on duct drawing designed by the project consultant these panels are cut at 45 degrees. The reason why these panels are cut at this angle is to place PIR parts onto each other to spread liquid adhesives and intercept foams from being exposed to the air but to ensure that corners are covered by aluminum tape.  Second, by utilizing U shape plastic PVC profiles and also H Bayonet the duct pieces are connected, and simultaneously the duct is mounted to the ceiling. Finally, unlike galvanized ducts, pre-insulated ducts have lower weight which means using lighter suspension. Moreover, a threaded rod and galvanized angle are utilized to enforce the suspension. Also in some sensitive and corrosive environments, aluminum or steel angles and rebars are used.

Technical Information

Polyurethane Insulation Panel
Thickness(mm) 20/30
Density (kg/m3) 45 + - 3
Panel Dimension(mm) 1200x4000
Thermal Conductivity (W/m.k)۰.۰۲۰
Aliminum Foil Finish Embossed/Embossed
Fire & Smoke Classification Class "O" BS 476
Part 6&7
Class "A" ASTM E84
PVC Joint Profile
Thickness(mm) 20
Code 20AC10
Length(m) 4
Aluminum Profile
Thickness(mm) 20/30
Code 20AC14
30AC14
Length(m) 4
Aluminum Reinforcement Bar
Thickness(mm) 14
Code AC18
Length(m) 4
Corner Plate
Thickness(mm) 20/30
Code 20AC13
30AC13
Polymer H Bayonet
Thickness(mm) 20/30
Code 20AC11
30AC11
Length(m) 4
Aluminum Tape
Width 50mm for 20mm Panel
75mm for 30mm Panel
Code 20M24
30M24
PalDuct Sealant
Code M25
Palduct Adhensive
Capacity 15kg/Tin
Code M23
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