Advantages
Inject outlets are very well adapted to industrial applications and dirty environments. They have a high resistance against dust, fumes and general heavy processes. The inject duct is made using an airtight material so there is no in dust accumulation. This limits the need for maintenance & reduces cleaning requirements to a simple wipe down of the inner & outer surfaces.

Function
This Inject duct is made using a special type of polyester with a soft PVC coating on both sides. The coating makes the inject duct non permeable (air tight) and this means that the duct works on a entirely different principle to permeable & slot diffuser ducts. By introducing perforations in the material the air is allowed to exit at high speed resulting in thorough mixing & entrainment of the room & supply air.

This makes the Inject product suitable for areas with quite high air changes without causing draughts. Typical applications are heating systems where a long throw is not called for, i.e. rooms with a limited ceiling height. In addition to this we specify the Inject duct for tempered fresh air ventilation where the inlet air is ambient air at near isotherm temperature.

We can also use these ducts for light cooling so as long as the supply air is above the dew point temperature.

Technique
With inject ducts the PVC coated material will have either 4 mm or 18 mm perforations for diffusion, available as a variety of patterns, depending upon the specific application.

The air exits through these perforations at high speed (typically 11-15 m/s), encouraging mixing and entrainment. With different perforation arrangements different air patterns can be achieved. Whatever arrangement is required we typically design these systems to achieve highly effective mixing of room & supply air.