How PIV Systems Work
Air Intake and Filtration:
- Source of Air: PIV systems typically draw air from the loft space or directly from outside. The
loft air is often used because it is generally warmer and less humid than outdoor air,
especially in winter. - Filtration: The incoming air is passed through a filter to remove dust, pollen, and other
airborne particles, ensuring that the air introduced into the living space is clean.
Air Distribution:
Central Diffuser: The filtered air is then distributed throughout the home via a central ceiling
diffuser, usually located in the hallway or landing. This central position helps the air to circulate
efficiently throughout the property.
Positive Pressure: The PIV system creates a slight positive pressure within the home, which helps to
push stale, moist air out through natural leakage points such as cracks, vents, and gaps around doors
and windows.
Humidity Control:
Dilution of Moist Air: By constantly introducing fresh air, the PIV system dilutes the indoor air,
reducing relative humidity levels and helping to prevent condensation.
Evaporation: Over time, the lower humidity levels help to dry out existing mould and mildew,
making it easier to clean and preventing regrowth.
Types of PIV Systems
Loft-Mounted Units:
PPS/L/H Loft Model DC Motor with Heater: This model includes a built-in heater to temper the
incoming air during colder months, providing comfort without significant increases in heating costs.
PPS/L Loft Model DC Motor: Similar to the loft model with heater but without the heating element,
suitable for properties where additional heating of the incoming air is not necessary.
Wall-Mounted Units:
PPS/W/H Apartment/Flat Model DC Motor with Heater: Designed for properties without loft space,
such as apartments and flats. This model includes a heater to ensure the air remains warm and
comfortable.
Benefits of PIV Systems
Health Benefits:
Improved Air Quality: By filtering out pollutants, allergens, and dust, PIV systems contribute to a
healthier indoor environment, which is particularly beneficial for individuals with respiratory
conditions such as asthma or allergies.
Mould Prevention: Reduced humidity levels prevent the growth of mould and mildew, which can
cause respiratory problems and allergies.
Property Maintenance:
Prevention of Damp and Condensation within owner occupied homes and HMO’s: Lower humidity
levels help to prevent dampness and condensation, protecting the property’s structure and reducing
maintenance costs.
Preservation of Interiors within HMO’s and conventional homes: Preventing mould and mildew helps
to preserve interior decorations, furnishings, and paintwork, maintaining the aesthetic appeal and
value of the property.
Energy Efficiency:
Low Energy Consumption: Electrical Wholesalers nowadays stock Modern PIV units that are
designed to be energy-efficient, often using DC motors that consume less power.
Supplemental Heating: Units with built-in heaters use minimal energy to temper incoming air, which
can be more cost-effective than heating the entire property.
Installation and Maintenance
Installation:
Loft Installation: Loft-mounted units are installed in the loft space and connected to the central
diffuser via ducting. This type of installation is relatively straightforward and minimally invasive. For
many homeowners and HMO landlords, within the loft is the preferred installation option.
Wall Installation: Wall-mounted units are installed on an exterior wall and may require a vent to
draw in outside air. These units are suitable for properties without loft space, such as flats,
apartments and offices.
Maintenance:
Filter Replacement: Filters need to be checked and replaced periodically to ensure the system
continues to provide clean air. The frequency of replacement depends on the air quality and
manufacturer recommendations. Filters can be purchased via CWS Electrical Wholesalers in
Birmingham on 0121 439 8010.
System Check: Regular checks of the system, including the motor and any heating elements, help
ensure optimal performance and longevity.
Practical Considerations
Property Suitability:
Type of Property: PIV systems are suitable for a wide range of properties, including houses, HMO’s,
apartments, and bungalows. They are particularly useful in older homes with poor ventilation and
poor air flow.
Space Availability: Ensure there is adequate space in the loft or outside walls for installation.
Cost:
Initial Investment: The cost of purchasing and installing a PIV system can vary. However, the benefits
in terms of health, property preservation, and reduced heating bills can outweigh the initial
investment. Your local electrical wholesaler will generally purchase PIV systems in bulk from
manufacturers. CWS Birmingham are one such wholesaler who purchase PIV systems in bulk from
National Ventilation LTD, Vent-Axia LTD and Envirovent LTD.
Operational Costs: Running costs are generally low due to the energy efficiency of modern units.
Regulatory Compliance:
Building Codes: Ensure that the installation complies with local building codes and regulations.
Professional installation by certified technicians is often recommended.
By understanding these detailed aspects of Positive Input Ventilation systems, homeowners and
property managers in Birmingham can make informed decisions to improve indoor air quality,
reduce humidity, and maintain healthy living environments.
If you require further information or technical advice, please call CWS Electrical Wholesalers in
Birmingham on 0121 439 8010.
