PIV (Positive input ventilation) systems are not allowed in many European countries
This is because they overcome the insulation added to the home such as double glazing and insulation, thus making the home less energy efficient overall.
L'air froid extérieur entre par le loft
L'air du grenier entre par les ouvertures de ventilation du toit vers l'extérieur.
Cet air est chauffé par le chauffage domestique
As cold air from the outside is forced into the home, it mixes with the warm air inside the home that is already humid.
Cet air chauffé est forcé à l'extérieur
Warm, humid inside air is forced to the outside through gaps around the home: no home is air tight.
Qu'est-ce que l'alternative CHEAP ENVIROVENT ?
Excess moisture is trapped in the home causing dampness, mould and condensation; it’s a modern problem. The more we seal a home to keep in the heat, the more dampness is retained inside. Instead, the PIV system pressurizes the home, forcing air out through natural openings. No door or window is fully sealed and air can be forced through even the ceiling to the roof space.
DH1200, une meilleure alternative ou simplement une alternative écologique bon marché ?
Le DH1200 peut aspirer l'air des chambres ou des salles de bains, le sécher puis le remettre à l'endroit voulu. L'excès d'humidité peut être évacué vers l'extérieur.VOIR LE DH1200
So, here is the sales pitch for the PIV System:
PIV systems work as a whole house ventilation system and create a unique and healthy living environment by supplying fresh, filtered air into a property at a continuous rate throughout.
PIV is required when you:
✔ Don’t want to do a full renovation.
✔ Require a whole house ventilation solution.
✔ Don’t want to remove any walls or go back to brickwork.
But here’s the truth of what it is saying – PIV
PIV works as a whole house ventilation system, bypassing the expensive insulation that you would otherwise put in place.
This creates colder, gustier air in the home, which indeed feels fresher. Healthy environments do need fresh air but your home is actually designed for that anyway. The real issue is to take away the condensation but leave the heat in at a continuous regulated rate throughout depending on the humidity level.
PIV is required when you:
✔ Don’t care about heat or heating bills.
✔ Require a door to be left open when it’s operation but don’t want the security risk.
✔ Think that you need to remove all plaster back to the brickwork in the home to solve a condensation problem.
See the cheap PIV alternative you can install yourself Here