Our fans adhere to the following ISO requirements:

  • Tested to ISO 5801 & BS 848 Part 1

  • Aerodynamic Performance testing to ISO 5801 and AMCA 210

  • Site Aerodynamic testing to ISO 5802

  • Balanced to ISO1940, ISO14694, and ISO10816 standards.

  • Tolerances to ISO 13348 – AN3

  • Vibration level tests to ISO 14596

  • Efficiency testing – ISO 12759

  • Welding Standards – ISO 3438 and ASME 9

  • Safety Standards – ISO 12499 and EN 14461

ToughVent’s aerodynamically tested and optimized design provides a ventilation solution that delivers maximum air power at the highest energy efficiencies. 

Turnstone Ventilation Systems and affiliates offer a turnkey solution to underground ventilation challenges. Rather than being just a seller of ducting and fans, we aim to combine numerous disciplines to provide a total system solution.

The ToughVent range is suitable for use in auxiliary applications and includes booster fans and bulk air cooler fans for use in underground operations.



  • Integral inlet guide vane and aerofoil impeller nose cone.

  • Variable pitch full aerofoil section cast steel and aluminum blades.

  • Fabricated steel hub assembly.

  • Steel aerofoil section rotor nacelle assembly.

  • Heavy duty rollover terminal box to IP65.


  • Upstream guide vane to pre swirl air onto impeller.

  • CAD enhanced nose cone on the impeller for improved efficiency.

  • Variable pitch steel impeller allowing for task-specific duty application.

  • Steel rotor assembly fully welded to the inside of the casing and onto a motor mount nacelle adding structural strength.

  • Modular impeller track providing double protection for the fan on this critical area.

  • Motor is flange mounted at the drive end bearing, onto a machined surface on the nacelle and also has fabricated struts, supporting the back of the motor.

  • An optional air straightener can be fitted down steam of the impeller to prevent air swirl onto flexible ducting.

Turnstone provides ventilation equipment, specifically to mining, tunneling, and industrial temperature control markets, that promote industry leading safety and efficiency.

Turnstone Industrial Solutions

271 Gawthrop Drive

Winchester, KY 40391

P: 859-745-8720

A joint venture between ABC Technology Group USA and Calandra Group, LLC