High-Performance Air Systems
High performance air systems (HPAS), when correctly designed and installed, are still the gold standard for energy efficient HVAC system, outperforming "new" technologies such as chilled beam and variable refrigerant flow systems. An HPAS can incorporate many elements including the latest in VAV technology, sophisticated controls, static regain design methods, low temperature supply air,and air side economizers to maximize free cooling. But, all HPAS require the use of spiral duct and fittings to provide the system with the least resistance, and the best leakage performance.
Spiral is ideal for high performance systems, but not all systems are high performance. Still the advantage of spiral systems, low-leakage, light weight, easy to seal and install are the attributes that any owner or engineer is looking for in a conventional HVAC installation.
Sound Control Applications
Break-out noise and system noise are just two of the issues that can plague the acoustical environment of all buildings. Controlling these noises can be critical especially in applications such as schools or performance venues. Eastern dual-wall round and dual-wall flat oval spiral duct and fittings provide an effective way to control both kinds of noise. Round, with no flat surfaces, and flat oval with less flat surface than rectangle, are naturally resistant to breakout noise whether dual-wall or single wall. The use of dual-wall duct, that is, duct where the inner wall of the spiral duct is perforated providing a path for the sound to be asborbed by the sound deadening insulation, is a cost effective way of dealing with sound propagatian and transmission noise.
We think spiral duct looks great, but sometimes people just don't want to see it. For those rare occasions, maybe a church sanctuary or a theater, Eastern has a solution, poly coated underground duct work. Our Eastern PCS for underground is a robust and corrosion resistant spiral duct which is ideal for your underground application.
The superior air handling characteristics of round are well known, and round duct has been the duct of choice for the fume extraction industry. In the case of fumes, where abrasion is not an issue, the lighter rigid walls of machine made spiral duct can result in significant savings over hand fabricated round duct. Spiral duct for fume removal is readily available in 304 and 316 stainless steels as well as polycoated products, which in some instances can outperform stainless, such as Eastern PCS.
Like fume extraction duct, dust removal duct is usually round. In dust removal applications where abrasion is not a major issue, Class 1 and Class 2, the use of spiral duct in lieu of hand-made duct can result in significant savings.
Spiral duct is the preferred duct for exposed duct systems. It has an aesthetically pleasing helical seam that can be seen in both large volumes spaces like retail outlets and transportation hubs, as well as more intimate settings such as lofts and restaurants where spiral can lend a industrial chic to the space. Exposed duct can be left unpainted or can easily be painted on the jobsite to match the color scheme of your choice.