MoffittVent natural ventilator

MoffittVent provides continuous extract ventilation for most kinds of industrial buildings, providing high volume ventilation. It is aerodynamically designed to provide continuous weatherproof ventilation. The unit can be adapted to accept sound absorbers.

Where a low profile, relatively low weight unit is required, we recommend the Colt Labyrinth.

Product information

Features and benefits

Efficient - MoffittVent is efficient in operation and provides continuous ventilation in all weather. It has 100% free area to face area ratio.

The ventilator is not affected by the direction or velocity of the wind - in fact its performance will increase in higher wind conditions.

Weather resistant – The ventilator’s design will not allow water entry into the building at any wind velocity. All water is collected by integral drain gutters and downspouts and re-directed out to the roof.

The ventilator has been designed to withstand wind speeds as high as 210 km/h and can be easily designed for higher wind speeds if required.

Optional damper – An optional manual or motorized damper ensures that air leakage is kept to a minimum when ventilation is not required.

Various fixing options - MoffittVent can be installed onto most kinds of roofs, either at the peak, down slope or on a flat roof. It is compact, so it requires a small area of roof to be cut out.

Easy to install - MoffittVent is delivered to site in breakdown form for easy local assembly.

Durable - MoffittVent is manufactured from tough, corrosion-resistant materials.

Low in maintenance – MoffittVent requires virtually no maintenance.

Design service - Colt provides a pre-order design service. Please contact Colt for more information relating to the application, specification, installation or servicing of MoffittVent.



Clear opening natural ventilator, for natural day to day ventilation.

Dimensions / size range

  • From 24” throat width to 180” throat widths.
  • From 10’-0” throat to any length

Damper options

  • Without damper
  • Manual damper – direct chain pull from below unit
  • Manual damper – indirect winch operation
  • Motorized damper
  • Roof operated damper

Acoustic options

  • Sound baffles fitted below unit

Sheeting options

  • Mill finish Galvalume (aluminized steel)
  • Painted – Kynar, Vinyl Plastisol and other specialty coatings are available
  • Aluminum
  • Stainless steel
  • Versacorr

Frame options

  • Hot dip galvanized frames
  • Corrosion resistant coating for frames

Screen options

  • Galvanized bird screen
  • Aluminum bird screen



Max. wind speed 130 MPH+
Snowload class Unrestricted
Water tightness 100%
Sound insulation (R’w) Depends on performance of baffle
Airflow Project-specific engineered to meet specified heat load or air change removal rates
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