phenolic duct board are used in ventilation, heating, air conditioning to remove and deliver air. The required airflows include, for instance, supply air, exhaust air and return air. Ducts also deliver ventilation air as a portion of the supply air. Air ducts are one way of ensuring satisfactory indoor air quality and thermal comfort.
Fabricating materials are as follows:
Galvanized Steel
Galvanized steel is the typical and standard material applied in fabricating ductwork. For insulation reasons, metal ducts are lined with the faced fiberglass blankets or wrapped outside with the fiberglass blankets.
When called for, a dual walled duct is applied.
Aluminium
Aluminium ductwork is quick and lightweight to install. Also, unusual shapes or customs of ducts can be directly fabricated in on-site or in the form. The ductwork construction begins with the duct outline tracing onto the aluminium pre-insulated panel.
Phenolic and Polyurethane Insulation Panels
Traditionally, air ductwork manufactured from sheet metal that is fitted first and then insulated with insulation. Currently, a sheet metal fabrication shop can commonly fabricate a galvanized steel duct and then cover with duct wrap ahead of installation. Though, ductwork made from inflexible insulation panels do not require any additional insulation and can be fixed in a single step.
Fiberglass Duct Panel
Fiberglass duct panel give built-in thermal lining as well as the inner surface engrosses sound, assisting to deliver the FIVAC system quiet operation. The duct board is shaped by descending a specially-designed knife with the board by use of a straightedge as a controller.
Flexible Ducting
Flexible ducts are typically made of supple plastic over a metallic wire coil to form a tube. They have a diversity of outlines. In the U.S.A. the insulation is typically glass wool, nonetheless, other markets, for example, Australia, use both glass wool and polyester fiber for thermal insulation.
Fabric Ducting
It is an air distribution item and is not projected as a channel for conditioned air. The phrase fabric duct is then somehow deceptive; fabric air dispersion system can be the most conclusive name. Though, as it often substitutes hard ductwork, it is simple to perceive it quickly as a duct. Habitually manufactured from polyester material, they can provide an even distribution and amalgamation of the conditioned air in a space than a conservative duct system.
Waterproofing
The finishing for external ductwork open to the weather is sheet steel coated with a zinc alloy/aluminum; a fiber reinforced polymer, a multilayer laminate or other waterproof coating.
Unfortunately, in the last couple of years, rising commodity prices especially industrial metals such as steel and aluminum have seen a gradual increase in the cost of buildings. Galvanized steel and aluminum have traditionally been used as the main materials for insulating houses. Thus increasing the price of these metals meant that the cost of insulating houses would also increase. Faced with this challenge, engineers and architects had to come up with a cheaper, durable, and reliable substitute.
Pre insulated ducts was introduced as a perfect solution to the problem. The ducts are a form of foam insulating HVAC ductwork that is increasingly becoming very popular in the construction industry. Insulating foams such as pre insulated ducts have proved to be very cost effective because for one they are much lighter, cheaper, and versatile. In addition to this, these ducts come in various sizes, designs, and offer protection from air leakage. The ducts provide various acoustic and thermal benefits depending on the type of duct used and the location that they are installed.
Because these ducts are already pre insulated it is much easier to use them because they do not need additional work at the construction site. This makes their installation cheaper when compared to other kinds of foam insulating products. However, it is important to make sure that you purchase the duct panels most suitable for your kind of building. This is because different kinds are best suited for certain types of buildings or purposes. Fortunately, the ducts can be used as ceiling, wall, floor, and air duct linings just like most foam insulating products.
Unlike other forms of foam insulating products such as phenolic board disadvantages and Polyurethane duct panels that are made of an aldehyde and phenol based plastic, Pre insulated ducts are made from a special kind of glasswool. To make ducts with different features or shapes each form of duct is made by folding and cutting the glasswool duct boards into different kinds of profiles.
In general, Pre insulating products have more benefits when compared to sheet metals. For instance, they are able to resist moulds and fires better than sheet metals. However, the ultimate decision on what is the best insulating product will depend on the special characteristics of the building and the architects or engineer’s decision.
