What is PIV - Positive Input Ventilation?

Positive Input Ventilation (PIV) is a whole house air ventilation system that works by drawing in fresh, filtered air into a property from outside. These can be either installed in a loft space or on a wall in a flat or apartment. They ensure that a continuous supply of air is supplied into the home to eliminate or significantly reduce condensation. 

PIV systems create fresh and healthy living environments by supplying fresh, filtered air into a property at a continuous rate throughout a property and is our most popular method of whole house ventilation. Energy recovery ventilation systems provide a controlled way of ventilating a home while minimising energy loss. They reduce the costs of heating ventilated air in the winter by transferring heat from the warm inside exhaust air to the fresh (but cold) outside supply air. 

Are Positive Input Ventilation Units Noisy?

All of our PIV units are designed to perform with extremely low noise levels, always ensuring the best level of whole house air ventilation is maintained. 

How Effective Are PIV Units?

Positive Input Ventilation is a whole-house form of air ventilation which is designed to supply fresh air to the whole property. In some cases, where there is a remote wet room (kitchen, ensuite, bathroom, WC or utility room) we also advise fitting extractor fans.

The units are either situated in the loft in a house, or on a wall in an apartment to deliver whole house ventilation. They operate quietly in the background, eliminating condensation and preventing mould whilst maintaining healthy indoor air. All of our PIV units are fitted with an ultra-low watt motor to ensure minimum energy consumption.

Did you know that 95% of our customers experience an improvement in condensation within one week after having a unit fitted?

How Does PIV Differ?

The EnviroVent Range of Positive Input Ventilation systems are accredited with BBA certification: 03/4043. These are sophisticated whole house ventilation systems, which dilute, displace and replace high humidity levels to control condensation and mould growth.

Trickle vents are not required, provided that the whole house ventilation rate is met in Table 5.1B of Part F and the requirements of the BBA certificate are met.. It is recommended that extract fans are installed if there is a remote wet zone that is located away from a central hallway.

Positive Input Ventilation is an all year round system that is a cheaper option than heat recovery ventilation. Systems can also be extremely energy efficient, taking advantage of the benefit of solar gain from the loft space and providing heat distribution.

This can save around 10% of annual heating costs per year. With lower humidity levels, the dust mite population is also reduced, a major trigger for asthma sufferers. Indoor air quality is improved to transform a stale, humid atmosphere into a fresh, healthy, condensation-free environment.

Unsure if PIV is Right For You?

It can be difficult to know which ventilation system is right for you or even what would be possible to install in your home, that's why we offer a free survey.

During a free home survey your local expert will assess any condensation, damp and mould problems that you may be facing in your property and take readings of the relative humidity levels throughout the property.

All our ventilation specialists are highly trained in carrying out home surveys to identify any underlying problems and make recommendations to ensure the correct solution is provided, all complying with current Building Regulations.

When you choose EnviroVent, you can be sure of receiving a professional service from your first call with your local ventilation specialist through to installation with our qualified ventilation engineers. We pride ourselves on the quality of our ventilation products and offer long term warranties to protect your home and your health.

Click here to browse our range of PIV products