Limit the Danger of Black Mould with PoziDry Units

In this article we will be exploring how you can limit the danger of black mould with the utilisation of PoziDry PIV units.

What is Black mould?

Black mould is a common property issue caused by the buildup of moisture through poor ventilation and high levels of humidity in the air (condensation).

If left untreated, black mould can seriously degrade the structural integrity and aesthetics of a property. More worryingly, in extreme cases the spores released by this type of mould can lead to potential health issues for occupants.

Black mould can be found anywhere around the home, and is especially prevalent in:

  • Bathrooms
  • Kitchen/laundry rooms
  • Bedrooms
  • Attics/basements

What are the specific health risks associated with black mould, and how does it impact occupants?

Black mould can cause respiratory issues, allergies, and exacerbate existing conditions like asthma. Prolonged exposure may lead to more severe health problems.

How can a PoziDry PIV Unit help?

What is a PIV unit?

A Positive Input Ventilation (PIV) unit is an air introducing appliance that is an extremely effective method of solving mould/condensation problems within properties.

How do PIV units work?

Often loft mounted, a PIV draws in fresh outside air through filters and directs it into the living areas of a property via a small, unobtrusive ceiling grill usually located in a hallway.

The stagnant, moisture-laden air is actually forced out of the house by the pressure of the fresh, dry air being introduced. 

This process is continual, ensuring the air within the property is constantly fresh, eradicating condensation and mould growth.

Are PIV units effective?

PIV appliances, especially premium models such as Vent-Axia PoziDry units, offer the most effective way of halting/preventing black mould growth in a home.

After just a couple weeks of operation, a PIV unit can garner amazing results in mould control, some residents even claim to have witnessed positive results after a few days!

Do PIV units take up a lot of space?

Many of our PIV units are succinct and extremely easy to install, the Vent-Axia Lo Carbon PoziDry Compact Pro for example, is the smallest PIV on the market, packing a punch while not being conspicuous at all.

Won’t a PIV make my home colder?

The fresh, dry air being drawn into a property will generally be sourced from outside of the loft/attic area, so technically this could lower the temperature within a home, however, most elite PIV units, such as the Vent-Axia PoziDry Pro Positive are available with their own heater included.

Are PoziDry PIV units expensive?

For the stellar service they provide, PoziDry PIV units are extremely cost effective. A top-end PIV will often cost in the region of £300-£350.

An efficient PIV unit runs continuously at a very low speed, this is actually rather inexpensive with running costs being as low as £10 annually!

Can a PIV unit be installed in a flat/apartment?

Yes, many Positive Input Ventilation (PIV) units  have the functionality for surface mounting due to anti-vibration legs, meaning no matter the style or size of your home, you’ll never have to compromise on air quality.

Is professional installation recommended for PIV units, or can homeowners install them themselves?

Professional installation is often recommended to ensure proper placement and functionality. However, some homeowners with electrical experience may be able to install simpler models themselves.

Are there ongoing maintenance requirements for PIV units, and if so, what are they?

Yes, Positive Input Ventilation (PIV) units  require periodic filter replacement and inspection to ensure optimal performance. Additionally, cleaning the unit and ensuring proper ventilation ducts are essential for maintenance.

How does the effectiveness of PIV units compare to other methods of mould control, such as dehumidifiers or ventilation fans?

Positive Input Ventilation (PIV) units provide continuous ventilation, which can effectively reduce moisture and prevent mould growth. However, the effectiveness may vary depending on the severity of the moisture issue and the specific conditions of the property. Comparatively, dehumidifiers and ventilation fans may offer targeted moisture control but may not provide the same level of continuous ventilation throughout the property.


We are a family run business in the North West, with over 40 years of experience in heating, ventilation and air conditioning services!

Our dedicated team also consists of experienced and qualified engineers to help and guide you with any requirements or questions you may have.

We also know price matters, so we aim to be as competitive and flexible as possible, and have discounted offers available.

If you’ve liked what you’ve been reading, contact us today, we’re here to help!