Which type of roof air vent is best for my trailer or vehicle?

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The 3 most popular and economical types of roof air vents in Australia for trailer use is the Rotary ventilator, Muller ventilator and Pop-up air vent.
Used for enclosed trailers, horsefloats, canopy, camper, truck, boats, 4x4, livestock, bus, truck etc.

The 2 main different applications:
 A vent primarily blows air into the vehicle
A ventilator primarily draws air out of the vehicle
The 3 most common trailer air vents / ventilators in order of most popular use:
1. The Rotary, whirly turbine type ventilator is the best selling one in Australia today by far.

This air ventilator usually has 2 – 4 external wind vanes that start spinning when an air-stream from natural wind or motion of the vehicle, activates it.  This spinning then creates air suction against smaller internal air-vanes facing the opposite direction that are located at the base of the air ventilator (similar to how a turbo-charger works).  Often these air ventilators will spin freely just from the forces of natural wind even when the vehicle it is parked and be ventilating without you driving.

Rotary air ventilator


It is very hard for rain or insects to enter inside the vehicle through this rotary ventilator thus making it ideal for livestock transport. Remember, with this type of ventilator, the faster you drive the faster the air will be drawn out of the vehicle.


2. Second would be stylish PVC Muller type air ventilator.

This is a highly economical type of air extraction type roof ventilator. It is made of durable PVC white plastic to not rust and to reflect heat. It is very low profile so it will fit under many types of roof-racks. It is a stylish teardrop shape to look good on any roof.

Muller air ventilator


This air vent has a flow-through air design. When the vehicle starts moving, the air flows through the inlet at the front of the air vent and then exits out the back of the air vent. As it does this it creates a vacuum that draws stale air out from the inside of your vehicle. If it is raining, the water cannot enter into vehicle as this air vent is designed to direct water, or insects, out the back of the air vent (instead of into your vehicle). Even when the vehicle it is parked it will be ventilating a little from natural wind blowing through it too.


 Remember, with this type of ventilator, the faster you drive the faster the air will be drawn out of the vehicle.

3. Third would be the Pop-up type air vent - sometimes called solid-top air vents, rat-trap vents, as well.

These vents are usually not made from plastic as they need to be very strong. External frame is made of aluminium with rubber seal for exceptional waterproof / dustproof seal when closed. Steel lid is press-formed to ensure rigidity and best sealing when closed. These vents are sturdy enough to be installed forward opening into the wind to scoop large volumes of air into the vehicle. These air vents allow

Pop-up air ventcomplete stoppage of all cold air or rain into the vehicle in winter when closed.

Other infrequent applications of these pop-up vents: In very dusty conditions, these air vents can be installed to pressurise the inside of vehicle with clean air – which stops dusty air from being sucked inside the vehicle through small cracks, holes and other openings. Also, not so common, is to install one of these vents at the back of the vehicle (facing reverse) to draw air out while driving.

Note: If you wish to purchase one or more of these air vents / ventilators then email me for a quote by clicking on my link below - or go to my e-store.

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