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Black Hole Ventilators

"Black Hole" ventilation products offer a solution to some of the problems associated with conventional through-the-wall ventilation.

First, they avoid cold air and draughts passing into the room from outside. Second, they prevent light passing out of the room (hence "black hole"). Third, they effectively cut out traffic or other extraneous noises. Fourth, and finally, it prevents insects and other small vermin entering the house.

All too often occupiers resort to masking out or blanking off wall ventilators to stop cold air entering during wintertime. The Black Hole Ventilator will stop wind blasting in, as its baffled labyrinth slows down air flow and creates internal vortices thereby reducing draughts to a minimum.

Stadium ventilators are easy to fit, but we would strongly advise that you have a registered Registered Gas Fitter carry out a spillage test as a matter of good safe practice.

You can find a gas fitter near where you live by visiting their website at


Ventilators are all rated in terms of their ability to allow so-called "free air" to enter as ventilation to a room. Sometimes called "the effective Free Area" or simply "free area" - they all mean the same thing - this volume of free area is measured in square centimetres (

Complex and anti-draught ventilators are measured by the volume of air that they pass, that is, the "effective free area", and all ventilators should be marked accordingly with this rating.

In the United Kingdom, British Standards regulations require a ventilation rating of 5 (formerly 4.5 for every kiloWatt above 7 kiloWatts input rating for any room with a gas or solid fuel appliance. (Please note - "input" rating - not "output"). Most of our inset gas fires are rated below 7 kiloWatts Input and technically require no additional ventialtion - however, you should be guided by your registered gas fitter as to you specific requirements.

Non-UK shoppers should consult their local or national regulations which may differ from British Standards.

A Flush AirBrick Anti-Draught Ventilator showing cross-section through cavity wall
A Flush Air Brick Anti-Draught Ventilator showing cross-section through cavity wall.

Cross-Section of a typical Core Drill Ventilator
Cross-section of a typical Core Drill Ventilator

Cross-Section through a Black Hole Ventilator showing Labyrinth Baffles
Cross-section through a Black Hole Ventilator showing Labyrinth Baffles

The Stadium BM420 complete with Air Blast Cowl
The Stadium BM420 complete with Air Blast Cowl

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Please note that Delivery charges are NOT included. Any shipping or delivery charges are in addition to the quoted prices
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