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Environmental ventilation


Modern houses can be plagued with ventilation issues. In a large number of dwellings, poor ventilation can be responsible for condensation formation in colder weather as the moisture vapour in the built environment is unable to escape the building envelope. In other dwellings, in particular double storey buildings, heat build up can be intense and adding ventilation is the simplest and most environmentally friendly solution. Either way, the solution is the same - adding building ventilation to expel excessive moisture in the first instance and to expel excessive heat in the second instance.

Ducted ceiling void ventilation

In roof void to remove moisture - The most efficient home ventilation systems are ducted systems mounted in the roof void. These systems are ducted into each room of the dwelling (other than wet areas and toilets) and vented through the eaves, gables or direct through the roof. Controlled by a timer, the system operates at least four times daily (more if required), removing moist air from the dwelling and simultaneously introducing fresh air into the dwelling. This creates a cycle of fresh air in and stale moist air out, creating the perfect environment for drying the building envelope and eliminating the conditions that created condensation formation.

The number and size of fans required is determined by a mathematical equation which divides the output of the fan or fans by the cubic meterage of the dwelling in question.

In roof void to remove excessive heat - These systems are ducted into each room of the dwelling (other than wet areas and toilets) and vented through the eaves, gables or direct through the roof. Controlled by a timer or a hygrometer (controlled by humidity levels) , the system operates daily, removing hot air from the dwelling. As the heat rises to the ceiling of the internal rooms, the system turns on and exhaust the excess heat from the rooms. These ventilation systems help airconditioning systems to work far more efficiently and a large number of people choose these systems in preference to home airconditioning. At 42dBA, our fans are the quietest on the market and are further quietened by our installation procedure which mounts them onto a 20mm wooden platform which is in turn mounted onto a 20mm rubber sound deadening sheet.

Wall mounted single room ventilation

Wall mounted systems are designed to be installed in dwellings where there is no roof void and they are extremely effective at removing either moisture or heat from single rooms.

Ventilation Components and installation procedure

We use only the best (and quietest) fans

There are a lot of different fans on the market. One of our competitors calls them air pumps but they are in fact fans. Our fans are sourced locally but manufactured in Europe, have a five year warranty and are the quietest fans on the market (for fan specs, please click here). The decibel output is important, for obvious reasons.

Positioning and installing fans and ducting

Our fans are all mounted on a chipboard base with a 20mm rubber barrier installed between the fan base and the floor joists. They are then screwed onto the joists. The ducting is run to every cavity in the subfloor and the fans are balanced in the subfloor (subject to access) so that they are evenly distributed to allow an even spread of air throughout the subfloor.


The fans are installed with either a 24 hour waterproof timer (preset to run during daylight hours for a set period of time and adjustable) or via an hygrometer which turns itself on and off depending on humidity levels. The fans are generally set to run when occupants are not there and the times they run can be adjusted to suit.

Inspect and re-adjust

As part of our service, we will return to the property on a set date and check the moisture content of the crawl space and internal flooring and walls. Once we have established all moisture readings we will reset the timer up or down depending on the results we have achieved in the first month.