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Vehicle ventilation, explained by people who install it.

Buying guides, installation notes and answers to the questions bodybuilders, fleet managers and owners ask us every week.

Winter Ventilation: Snow Filters and Keeping Air Moving
Guide · 5 min read

Winter Ventilation: Snow Filters and Keeping Air Moving

Shutting a vehicle up for winter is how you get wet bedding and a dripping roof. How the snow filter, a closable valve and a fan on low speed keep the air moving through the cold months.

Van Conversion Ventilation Checklist: Before You Cut the Roof
Campers & Motorhomes · 7 min read

Van Conversion Ventilation Checklist: Before You Cut the Roof

The hole in the roof is the one job in a van conversion you cannot undo. Run through these ten checks first and the ventilator will fit first time, seal properly and run for years.

V12 Valve vs Flower Power vs Rotating Valve: Interior Finish
Guide · 7 min read

V12 Valve vs Flower Power vs Rotating Valve: Interior Finish

The roof fan is only half the job. What you see from inside, and whether you can close it, light it or steer it, depends on the valve or grille under the ceiling. Here is how the four options compare.

Turbo II vs Turbo III: Wind-Driven Ventilators Compared
Guide · 7 min read

Turbo II vs Turbo III: Wind-Driven Ventilators Compared

Three roof ventilators that need no electricity at all. The Turbo II and Turbo III spin on the air passing over the roof, the exhaust ventilator has no moving parts whatsoever. Here is how they compare and which vehicles each one suits.

Speedcontrol: A Speed Controller for Rooftop Ventilators, Why and How
Guide · 7 min read

Speedcontrol: A Speed Controller for Rooftop Ventilators, Why and How

A full-size roof ventilator has two speeds without a controller: off and loud. The Speedcontrol 30-3004 gives it every speed in between. Here is why that matters, how to wire it with a 3-way switch, and what it does to noise and battery draw.

Roof Hatch Buying Guide: Manual vs Electric Emergency Exit
Buses & Coaches · 6 min read

Roof Hatch Buying Guide: Manual vs Electric Emergency Exit

A coach roof hatch is ventilation, daylight and an emergency exit all in one opening. Here is how to choose between manual and electric, and how the control unit ties it together.

Roof Hatch 530 vs 970: Which Size for Your Bus or Coach?
Buses & Coaches · 7 min read

Roof Hatch 530 vs 970: Which Size for Your Bus or Coach?

A coach roof hatch is ventilation, daylight and, in the larger size, a legal emergency exit. Here is how to choose between the 530 x 530 and the 970 x 530, manual or electric, and what the control unit actually does.

Gift Ideas for Camper, Van and Bus Owners: Practical Upgrades from €9.68
Guide · 4 min read

Gift Ideas for Camper, Van and Bus Owners: Practical Upgrades from €9.68

Looking for a present for someone who lives half their life in a camper, van or bus? Skip the novelty mug. These are small upgrades they will actually fit and use, sorted by budget.

Vehicle Ventilation Maintenance: Cleaning and Troubleshooting
Guide · 6 min read

Vehicle Ventilation Maintenance: Cleaning and Troubleshooting

A practical maintenance routine for rooftop ventilators, grilles and valves, with a fault-finding order for fuses, switches and controllers, and a straight answer on when a motor is worth replacing.

Livestock Transport Ventilation: Welfare and Airflow Explained
Guide · 7 min read

Livestock Transport Ventilation: Welfare and Airflow Explained

Heat, moisture and ammonia build up fast in a closed livestock body. Here is how to make it breathe: fresh air in low, stale air out through the roof, and extraction that works with the engine off.

Le Mans vs Le Mans LL vs Round: Which Rooftop Ventilator?
Guide · 7 min read

Le Mans vs Le Mans LL vs Round: Which Rooftop Ventilator?

Three full-size rooftop ventilators, one 230 mm hole. The Le Mans, the brushless Le Mans LL and the Round look similar on the roof but behave very differently on the battery. Here is how to pick the right one.

Interior Valves and Grilles: Finishing the Ceiling Properly
Guide · 6 min read

Interior Valves and Grilles: Finishing the Ceiling Properly

The grille or valve under your roof fan sets airflow, draught control and the look of the ceiling. A fitter's guide to fixed grilles, closable valves, the V12 and the Flower Power LED valve.

Installing a Rooftop Ventilator: Step by Step Guide
Guide · 7 min read

Installing a Rooftop Ventilator: Step by Step Guide

Cutting a hole in a good roof feels drastic, but with a sharp hole saw, the right sealant and a tidy three-way switch, a rooftop ventilator is a half-day job. Here is how we do it.

How to Choose a Rooftop Ventilator for Your Van
Guide · 6 min read

How to Choose a Rooftop Ventilator for Your Van

Choosing a rooftop ventilator comes down to four questions: how much air, which voltage, what size hole, and which direction. Here is how an experienced converter works through them.

How Many Roof Ventilators Does Your Vehicle Need? The Airflow Calculation
Guide · 7 min read

How Many Roof Ventilators Does Your Vehicle Need? The Airflow Calculation

One fan or three? The answer is a short calculation: body volume in cubic metres, the air changes per hour the use demands, and the m³/h each ventilator delivers. Here it is, with four worked examples.

Horse Trailer Ventilation: Keep Horses Cool and Calm
Horse Trailers & Horseboxes · 6 min read

Horse Trailer Ventilation: Keep Horses Cool and Calm

A horse trailer is a small, sealed box carrying a large, warm animal. Here is how heat, ammonia and condensation build up inside it, and how a roof extractor paired with a floor inlet puts that right.

Food Truck and Catering Van Ventilation: Heat, Steam and Smells
Commercial Vans & Service Vehicles · 7 min read

Food Truck and Catering Van Ventilation: Heat, Steam and Smells

A food truck is a kitchen in a steel box with a hatch in one wall. Heat, steam and smells build up in minutes. Here is how to lay out roof extraction, inlets and lighting so the crew stays cool and the customers only smell what you want them to.

Floor Ventilators Explained: Why Your Roof Fan Needs an Inlet
Guide · 6 min read

Floor Ventilators Explained: Why Your Roof Fan Needs an Inlet

A roof fan can only extract what it can replace. Here is why a floor ventilator turns an extractor into a working system, and how to choose and place the 129 mm and 80 mm units.

Dog Transport Van Ventilation: Prevent Heat Stress
Dog & K9 Transport · 6 min read

Dog Transport Van Ventilation: Prevent Heat Stress

A dog in a crate in a parked van is at the mercy of the air around it. Here is how heat and humidity build up, and how a wind-driven or powered roof ventilator with a floor inlet keeps working dogs safe.

Condensation in Vans and Campers: How Ventilation Solves It
Campers & Motorhomes · 6 min read

Condensation in Vans and Campers: How Ventilation Solves It

Condensation is not a leak and it is not bad luck. It is warm, moist air meeting a cold panel. Here is where the water comes from and how a proper airflow path gets rid of it.

Coach and Bus Ventilation: Roof Hatches and Fans for Comfort
Buses & Coaches · 6 min read

Coach and Bus Ventilation: Roof Hatches and Fans for Comfort

A coach is a long room with fifty people in it. Two roof hatches, one forward and one aft, plus a powered fan for standing traffic, is the practical recipe for passenger comfort.

Camper Ventilation at Night: Sleep Cool, Wake Up Dry
Campers & Motorhomes · 6 min read

Camper Ventilation at Night: Sleep Cool, Wake Up Dry

A camper bedroom is a small, well-insulated box full of warm, damp air. Here is how to keep it cool in summer and dry in winter without noise or draughts.

Boat and Marine Cabin Ventilation: Damp Lockers and Galleys
Boats & Marine · 7 min read

Boat and Marine Cabin Ventilation: Damp Lockers and Galleys

A boat is a cold shell full of warm, wet air. The cure is a small, continuous exchange of air that carries the moisture out, whether you are aboard or not.

Ambulance Ventilation: Air Changes and EMC Explained
Ambulances & Emergency Vehicles · 7 min read

Ambulance Ventilation: Air Changes and EMC Explained

In an ambulance the ventilation system is clinical equipment, not a comfort extra. This guide covers air changes per hour, the airflow path, why the motor's EMC behaviour matters, and controls a crew can use with gloves on.

12V or 24V: Which Voltage Does Your Vehicle Use?
Guide · 5 min read

12V or 24V: Which Voltage Does Your Vehicle Use?

Fitting a ventilator or roof hatch to the wrong voltage is the most common ordering mistake we see. A few minutes with the handbook or a multimeter saves a lot of trouble.