Why PIV (Positive Input Ventilation) Systems Are Banned in Many European Countries

Many European countries prohibit the use of PIV systems because they counteract energy-saving measures like double glazing and home insulation. By introducing external air, these systems can reduce a home’s overall energy efficiency instead of improving it.

Outside Cold Air Enters From the Loft

Air in the loft space enters from ventilation gaps in the roof to the outside.

This air is heated by the Home Heating

As cold air from the outside is forced into the home, it mixes with the warm air inside the home that is already humid.

This Heated Air Is Forced Outside

Warm, humid inside air is forced to the outside through gaps around the home: no home is air tight.

What is the CHEAP ENVIROVENT Alternative?

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 better alternative or just a cheap envirovent alternative?

The DH1200 can draw air from bedrooms or bathrooms, dry the air then put it back to any point.  Excess moisture can be vented away to the outside.

SEE THE DH1200

dont just take our advice

Positive input ventilation in dwellings – Does it work? Test Results Here

Join the PIV debate Here

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
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