Perforated Ducts

One of the best air diffusion products on the open market.
SPIROJET is a modern and easy-to-use product. Manufactured in one-meter modules using green SPIROPACK technology, it ensures optimal indoor comfort and perfect temperature uniformity throughout the space.
Its high induction capacity prevents heat stratification. The modules are connected using the newly patented TWIN-LOCK collars, which require no welding.
Thanks to its highly competitive unit cost, exceptional induction rate, and high-quality components, SPIROJET perforated ducts rank among the best air diffusion products currently available on the market.

TECNOLOGY

How It Works

SPIROJET perforated ducts are composed of a series of one-meter modules, each comparable to a traditional high-induction diffuser.
The diffusion element is the perforation itself, which can be applied to any module regardless of the duct diameter.
The air exiting the holes induces ambient air at a rate generally 30 times higher than the volume of supply air.
By increasing the outlet velocity through the holes, it is possible to boost induction—often exceeding 50 air changes per hour (ACH)—although this may reduce the diffuser’s performance.
The diameter and number of holes applied to each SPIROJET module determine both its air throw capacity and its operating characteristics.

LEARN MORE

The design of a system using SPIROJET perforated ducts follows a traditional approach, distributing the ducts evenly in the upper part of the space according to the required airflow and the throw of each module—exactly as with all other types of diffusers.
Under normal operating conditions, the ambient air induced by the perforations ensures continuous ventilation of the duct’s outer surface, effectively preventing condensation formation.

The perforation layout of SPIROJET ducts is custom-calculated for each system using one of the most advanced CFD (Computational Fluid Dynamics) models available on the market, further enhanced by over thirty years of experience gained through the development of MIX-IND® technology.

SPIROJET perforated ducts deliver optimal performance under the following operating conditions:

Maximum recommended installation height for heating: 5 m

Maximum recommended air throw: 7 m

Optimal air velocity inside the duct: 5 m/s

Maximum ΔT during heating: 10 °C

Minimum supply air temperature: 12 °C

 

The Advantages

The main advantages of SPIROJET perforated ducts, compared to traditional air distribution systems such as insulated ducts with grilles or diffusers, are:

  • Very competitive cost

  • Strong aesthetic appeal

  • No need for thermal insulation

  • High-quality air distribution

  • Wide range of material options

  • Available in circular, semi-circular, or custom shapes

  • Easy on-site installation

  • Reduced installation and transportation costs

  • Extremely high manufacturing quality

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