What Is a PIV Unit? Positive Input Ventilation

What Is a PIV Unit? Positive Input Ventilation

What Is a PIV Unit? Positive Input Ventilation

For anyone on the market for ventilation solutions in their home, PIV units may be something that you’ve heard or seen during your search. But what exactly are they? And how good are they really?

In this blog, we will answer the question ‘What is a PIV unit?’

To prevent mould, fresh air should constantly be introduced into your dwelling daily, as it helps to regulate temperature and reduce condensation. Introducing fresh air can be as simple as having a ventilation routine, or installing extractors or PIV systems. Almost all of this is facilitated by ducting.

I-Sells is here to provide the answers you need whilst also supplying you with all the information you need to combat mould and have a well-ventilated home.

The purpose of ventilation

The purpose of ventilation

Ventilation is a key principle that should be applied in every kind of dwelling, ventilation is crucial for us all, as we need oxygen to survive. And logically, the cleaner air you have, the better.

Ventilation also helps to eradicate smells in a space, as well as humidity and condensation. Though arguably the main purpose of ventilation is to prevent the development of mould within the dwelling.

Ventilation and mould

Mould, otherwise known as damp, is a fungus that grows on wet surfaces. Mould comes in a variety of colours: Black, Green, Brown, Grey and White. It can be difficult to identify mould by colour as it can occur in many shades. Some of the most common mould strains in the home are:

  • Black Mould – Also called Stachybotrys chartarum, Black mould is commonly found in bathrooms and wet rooms but can also occur on cold exterior walls in habitable rooms such as the bedroom or living room.
  • Cladosporium – Commonly found in bathrooms, under sinks, and around faucets but it can grow on surfaces like carpets, furniture, walls, and floors.

Mould reproduces from tiny spores. The spores float through the air and deposit on the surfaces. Under adequate temperature, moisture, and nutrient conditions, the spores can form new mould colonies.

Mould can severely affect your immune and respiratory system, as the spores are easily breathable and not obvious to see through the human eye.

If you have found mould in your home, you need to assess if this is your landlord’s responsibility (for example it could be from a leaking roof that needs repairing). Or if the damp is caused by improper ventilation. To assess your options, click here.

What is a PIV Unit? Positive Input Ventilation

A PIV unit is a ventilation system that optomises airflow by extracting stale, humid air, and replaces it with air that it has extracted from outside. This outside air is passed through a filter to ensure there are no pollutants entering your home.

Furthermore, PIV units also have temperature settings which ensures that the fresh air entering the home isn’t going to make it colder than it should be.

Here are some benefits of PIV units.

  • Cures condensation dampness – PIV reduces the humidity in the air, curing condensation dampness preventing mould growth
  • Improved indoor air quality and healthy living environment- Indoor pollutants from cooking and cleaning, as well as outdoor pollutants including pollen and Radon gas, are eradicated from the home
  • A Unique cost-effective solution
  • Meets Regulations – Meets Part F & L of Building Regulations as a low-energy ventilation strategy
  • Easy & simple installation – Typically installed in under one hour
  • System controls located in the ceiling diffuser for easy commission and access for maintenance checks
  • Low maintenance – Filter clean or replacement every five years
  • Energy efficient – System goes into standby during warmer months when there is no evidence of condensation
  • Clinically proven to help allergy and asthma sufferers

Are PIV units necessary?

PIV units are a welcome addition to any home that understands the value of having clean and fresh air in the home. Although there are methods you can use to gain similar results, PIV units are the best method to get those results by far.

What happens if I don’t have a PIV unit?

Not having a PIV unit is not the end of the world, as long as you have extractor fans in the relevant areas of your home, and regularly open your windows, you will for the most part get the same effect as a PIV system.

Though it must be said, the filter of a PIV system, as well as the heating systems guarantees fresh air for your home, whereas only opening a window and allowing unfiltered air in could be harmful to those with allergies. Of course, we don’t want to open windows at all when the weather is bad, wheras the PIV units don’t have to worry about at all.

Can I install a PIV unit myself?

Can I install a PIV unit myself?

Unless you are a qualified electrician, or have had experience in installing PIV systems in the past, then no. You should not install a PIV unit yourself if you have no experience, you don’t want to be responsible for any mistakes that may occur during your installation.

We understand that not all of our readers may have the contacts, or know who to go to when searching for someone to install their PIV unit, click here to find local, trusted electricians.

Are PIV units better than extractor fans?

In terms of function, yes, PIV units are better than a extractor fan. An extractor fan only extracts indoor air whereas a PIV unit replaces this extracted air with fresh, filtered outdoor air.

Though it must be noted, the extractor fans we provide for your kitchen and bathroom, are still worth having even if you have a PIV system. Here’s why.

Bathrooms generate a lot of steam through having baths and showers. Kitchens also generate a lot of steam as a result of cooking, boiling a kettle, using hot water etc. With that being said, as effective as PIV systems are, you shoudn’t neglect having certain individual rooms covered when it comes to extracting air.

Will PIV units remove mould?

If you already have mould in your home prior to installing a PIV system, then no, a PIV system will not remove mould. However, a PIV unit will create an environment where mould will struggle to thrive if at all.

Mould can be removed by using mould cleaning solutions, addressing any leaks within the home, and can be kept away through regular ventilation, something which a PIV system takes care of for you.

What can I use to remove mould?

As mentioned previously, we stock a range of mould removal products such as a mould surface cleaner, anti-mould paint and more.

We also sell equipment that helps you monitor humidity in your home (if this is an issue)

If you’re looking for natural remedies for mould, try spraying distilled white vinegar over the mouldy area, leave for an hour then wipe. This method is known to deal with light mould buildup.

Purchase a PIV unit today

Purchase a PIV unit today

We at I-Sells endeavour to ensure our customers have all the information they need before investing in our mould solutions. Be sure to visit our blog page to learn about the vast array of factors and issues surrounding ventilation, mould, condensation, and much more.

We hope to have answered the question “What is a PIV unit?’’

We understand you may have more questions, Do not hesitate to contact us for more information about whatever you need our help with. If you’d like to send us an email, click here. For other contact options, see below:

Call us on 020 8463 9696

Visit us at our showroom:


Monday – Friday: 8:00 am to 5:30 pm

Saturday: 9:00 am to 12:00 pm

Sunday: Closed

15 St John’s Parade

Sidcup, Kent

DA14 6ES

United Kingdom

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