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Efficient Air Distribution Over Long and Short Distances

We are committed to providing the best solutions for your air distribution needs. Roto-Jet® Spiral Duct Drum Grilles are designed to deliver adjustable airflow in both the horizontal and vertical planes. They are an excellent choice for large enclosures like theaters, convention halls and factories where long throw is required.
STRJ-U Universal Spiral Duct Drum Grille Single Vane

STRJ-U Universal Spiral Duct Drum Grille Single Vane

  • Can be installed in either horizontal or vertical orientation based on the architectural and engineering design conditions
  • Efficiently distributes air anywhere from 200 through 10,000 CFM
  • It is recommended not to use the optional opposed blade damper when pressure drop exceeds .25”
SDMTRJ Radius Spiral Duct Drum Grille Split Vane

SDMTRJ Radius Spiral Duct Drum Grille Split Vane

  • The outer borders of the unit are 1-1/4” wide and constructed of heavy-gauge extruded aluminum
  • Installs directly on spiral ducts without the use of duct taps
  • Felt seal between the drum and border prevents leakage and holds the drum securely
SDSTRJ Radius Spiral Duct Drum Grille Single Vane

SDSTRJ Radius Spiral Duct Drum Grille Single Vane

  • The unit is designed to handle large air capacity requirements and long throws
  • Adaptable to a variety of duct sizes without requiring any expensive duct taps
  • Unique extruded aluminum universal mounting frame offers a cost-effective installation
MTRJ-U Universal Spiral Duct Drum Grille Split Vane

MTRJ-U Universal Spiral Duct Drum Grille Split Vane

  • The extractor-damper eliminates the requirement for secondary extraction devices
  • A positive seal around the barrel is created by locking a gasket into the frame channel
  • Available in ML -Mill and WH - White finishes