Question: What is a PIV system (Positive Input Ventilation)?

Answer: A Positive Input Ventilation (PIV) system gently introduces filtered fresh air into your home (usually from a loft-mounted unit). This helps dilute moisture and stale air, which can reduce condensation and help prevent mould where everyday humidity and poor ventilation are the main issue.

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Question: Which PIV units do you install?

Answer: We install proven PIV systems including Vent-Axia Pure Air Home and Nuaire Drimaster models. We’ll recommend the best option based on your home size, loft access, and the symptoms you’re trying to solve.

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Question: What problems can PIV help with?

Answer: PIV is most commonly used to help with condensation, mould around windows, musty smells, and homes that feel “stuffy” due to poor airflow. It works best when the issue is moisture from normal day-to-day living (showers, cooking, drying clothes) rather than a leak or structural damp.

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Question: Will PIV fix mould and condensation in every home?

Answer: Not always. PIV can work very well where the problem is condensation-related moisture, but it won’t fix leaks, rising damp, penetrating damp, failed guttering, or other building defects, those issues need repairing first. Existing mould should also be cleaned/treated.

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Question: Do PIV units come with a heated option?

Answer: Yes, both Vent-Axia and Nuaire ranges offer heated versions. Heated PIV can help take the chill off the incoming air during colder months. Whether it’s worth it depends on the property and your preference.

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Question: Where is a PIV unit installed?

Answer: Most PIV systems are loft-mounted, with a ceiling diffuser fitted in a suitable location (commonly a landing/hallway). We position the diffuser to help air circulate effectively while keeping it comfortable and discreet.

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Question: Can I control it from the loft, or from the landing/hallway?

Answer: Control options vary by model. Some settings are set during installation (on the unit in the loft). Depending on the model chosen, user controls may also be available so you can adjust settings without needing loft access. We’ll talk you through the best control setup for your home.

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Question: Can I switch it on/off or use a boost mode?

Answer: PIV is usually designed to run continuously at a low level for best results. Some models and control options allow adjustments (including higher-rate settings depending on the unit). We’ll advise what’s available on the unit you choose and how we’ll set it up.

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Question: Are there different PIV options and price levels?

Answer: Yes. PIV systems come in different specifications and price points. A standard unit provides continuous, filtered ventilation.

Higher-spec models can be supplied with optional upgrades and add-ons (for example a heater, additional control options, or enhanced features depending on the manufacturer and model).

We’ll recommend the right setup based on your home, your symptoms, and your budget and we’ll clearly explain what each upgrade does and whether it’s worth it.

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Question: Will PIV make my house cold or create drafts?

Answer: Most people find the home feels fresher rather than colder. Air is supplied gently, not like a strong draft. If you’re concerned about cooler air in winter, we can recommend a heated unit.

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Question: Is a PIV system noisy?

Answer: These systems are designed for quiet, low-level operation. Noise is usually minimal when the unit is installed correctly and set up appropriately for the property.

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Question: What do you need from me to advise or quote for PIV?

Answer: For a quick, accurate quote, please send:

• Postcode

• Photos of the condensation/mould areas (windows/walls/ceilings)

• A photo of your loft hatch and (if possible) the loft space

• Tell us if you’d prefer heated or standard, and if you want easy user control options

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