The round duct profile is the most commonly used of all profiles.
It is typically found in open ceiling applications, where ceiling height is not an issue.
The duct diameter can be made as small or as large as required.
Using the shape retention accessories will keep the duct profile round even when the air is off, preventing the duct from
When working with round profiles, we use clock positions to determine the placement of the appropriate flow model(s). We always determine clock positions with the airflow coming from our back.
Duct systems – Shape Retention Options
Shape Retention Options ensure better looking ducts in periods when the ventilation system is turned off. With Internal 360° Hoops the duct is kept round regardless of whether the system is active; with All-in-One Support only a slight change of the circular shape occurs when the air is shut off. Both accessories also minimize the shock associated with inflating ducts in systems without a
soft start, otherwise known as “duct pop”.
The Internal 360° Hoops are mounted in sleeves on the inside of the ductwork creating a closed circuit around the circumference. This ensures an aesthetically pleasing duct that is kept open if the airflow is turned off. The hoops are removable for easy laundry.
Internal 360° Hoops are available in duct systems from Ø155 mm [Ø6 in] and up. The hoops come pre-installed from the factory on ducts up to Ø660 mm [Ø26 in]. For diameters above Ø660 mm [Ø26 in], the suspension fiberglass rods are added on site. Adding the hoops is an easy process, as they simply glide in place.
All-in-One Support (AiO) consists of semicircular hangers, made from anodized aluminum, sewn into pockets on the exterior of the duct at fixed intervals. These come pre-installed from the factory, which significantly reduces installation time compared to the systems
offered by other manufacturers. The All-in-One Support is easily removable for maintenance purposes. The appropriate suspension support depends on the diameter of the duct. The AiO Support will cover 180° of the duct’s circumference up to Ø1220 mm [Ø48 in]. For diameters above Ø1220 mm [Ø48 in], hanger coverage decreases due to shipping constraints. All-in-One provides additional support for 90° elbows.
The ideal fabric properties depend on the specific application: swimming pools require permeable fabric to prevent condensation; food processing may require anti-microbial fabric; a high school gym may require a custom color or logo print to match the school’s colors. FabricAir Dispersion Systems are custom engineered to create the ideal fit for each application’s specific requirements.
Options include anti-static, flame retardant, permanently flame retardant, non-combustible, impermeable, varying permeabilities and anti-microbial.
Permeable fabrics eliminate condensationon the duct surface by creating an air blanket surrounding the duct. These are ideal in humid spaces, such as food processing facilities or swimming pools, where there is a high probability of condensation.
Non-permeable fabrics are airtight. The air is distributed solely through the flow model. These ducts are typically made out of coated materials.