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Loft Mounted PIV Units
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PPS/LH PIV with Heater
MVA43
£265.00
Airflow
60 L/s
Noise
38dB
Energy
A+

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PAS Compliant

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Tackle winter condensation and improve indoor air quality with the Monsoon PPS/L/H Positive Pressure System. Fitted in the loft, the unit draws, filters and lightly warms incoming air before supplying it through a central ceiling diffuser. This continuous, tempered airflow dilutes humidity, odours and pollutants, pushing stale, moist air out through natural leakage paths and helping to keep your home dry, comfortable and healthy all year round. The built-in heater operates only when needed, maintaining comfort on colder days without excessive energy use. A high-efficiency EC motor delivers whisper-quiet performance and low running costs, while the long-life filter is quick to access for easy maintenance. Smart controls react to humidity and temperature peaks (e.g., after baths or cooking), switching from background trickle to boost automatically. Trusted Monsoon engineering, discreet loft installation and a single central diffuser provide whole-home impact with minimal visual change.

Key Features

  • Brand: Monsoon — PPS/L/H loft-mounted PIV with integral heater

  • Whole-home condensation & mould control from a single landing diffuser

  • Tempered fresh-air supply for improved comfort in colder weather

  • Quiet, energy-efficient EC motor (continuous trickle + demand boost)

  • Humidity/temperature responsive controls with adjustable boost

  • Long-life, easy-access filter improves air quality and reduces dust

  • Insulated ductwork to minimise heat loss and prevent condensation in ducts

  • Discreet install in loft space; low visual impact in living areas

  • Helps meet UK Building Regulations Part F ventilation guidance

What’s Included

  • Monsoon PPS/L/H loft PIV unit (heater integrated)

  • Insulated flexible duct and central ceiling diffuser (model dependent)

  • Filter cartridge (pre-installed)

  • Mounting feet/straps & fixings

  • Installation and user instructions

Ideal For

  • Houses & bungalows with persistent winter condensation

  • Colder or exposed properties where tempered supply air is preferred

  • Retrofits seeking an unobtrusive, energy-efficient whole-home solution

Installation Notes

  • Position on a stable loft deck with clear access; isolate via a fused spur (qualified electrician recommended).

  • Route insulated duct to a central landing diffuser for even distribution; keep duct runs short with gentle bends.

  • Ensure roof space is adequately ventilated or duct to external air as per Monsoon guidance.

  • Maintain background trickle vents in habitable rooms for balanced airflow.

Maintenance

  • Inspect/replace the Monsoon filter at recommended intervals (environment dependent).

  • Wipe the diffuser and check duct/insulation annually.

  • Test boost and control functions seasonally.

Technical Overview

  • Type: Loft-mounted PIV with integral heater

  • Motor: High-efficiency EC, continuous trickle + boost

  • Controls: Humidity/temperature responsive with adjustable settings

  • Duct size: Ø125–150 mm (model dependent)

  • Filter: Replaceable long-life (pre-installed)

  • Electrical: 220–240 V AC, fused spur (see datasheet for rating)

  • Housing: Robust polymer body; insulated flexible duct to diffuser

  • Compliance: Supports Part F ventilation strategies


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First4Ventilation says:

"We love Positive Input Ventilation which is also known as a positive pressure system. This draws large volumes of air from the loft, filters and in this unit heats it, and pushes it through the property using the pressure principle to force stale air out using the natural leakage points or via installed trickle vents. This is a proven and powerful ventilation solution which should show improvements in as little as 48 hours. Nicely quiet, well-built and fully featured. This is a great PIV or PPS solution."
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Consumer/Fitter says:

"A family member has had one of these PIV units working in their home for 25 years now with only some filter changes needed. Their home hasn’t got any damp or mould issues and always smells of fresh air because of the impact of this unit." That's why we fitted one to our place as soon as we moved in."
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