https://www.insulationsuperstore.co.uk/product/felt-lap-vent.html?msclkid=90848a0451d111343a62e9a446445ea3&utm_source=bing&utm_medium=cpc&utm_campaign=%5BAll%20Products%5D%20%5BCatch%20All%5D%20%5B14.02.19%20RL%5D%20%5BLP%5D%20PLA&utm_term=4579465931580105&utm_content=All%20Products The first step in installing Passyfier vents is to determine where you need them. Passyfier vents are ideal for installation in areas habitable rooms, such as bedrooms and living rooms. Keep in mind that the vents should be installed at a maximum distance of 12 inches below the ceiling height.

When installing a Passyfier Vent, you will need to create an opening in your external wall to accommodate the vent. The size of the opening will depend on the size of the vent you are installing. The Passyfier Sleeved 230 Vent provides an opening on a section of wall normal to the airflow direction with an effective area well in excess of the minimum requirement. Airflow through the opening is controlled automatically by the intervening mineral wool slab and thereby avoids undue draughts. The opening where the Passyfier vent will be installed must be cleaned and prepared beforehand. Remove any loose debris, paint, or dirt and ensure that the surface is smooth and level. However, it will be necessary to install two Passyfier Core-140 Vents to achieve almost the same (albeit slightly more) water vapour transmission as one Passyfier Sleeved-230 Wall Vent. Our passive air vents work on the passive ventilation principle. Suitable for almost all properties, they are an affordable alternative to mechanical systems. They introduce fresh, clean air into your home using only natural forces. What is passive ventilation?occupied building than on the outside . This pressure is completely independent of that in the air. For example, a Use the Passyfier Sleeved Vent Kit wherever practical to maximise the transmission of water vapour. PIV did not directly save any energy but may save a little when compared to conventional extraction providing the same level of ventilation exchange. This is because roof space temperatures are usually a minimum of 3OC higher than outside. within a dwelling is always higher than on the outside during the condensation season, and the moisture vapour

I’d be understating the case if I said that results were not particularly encouraging and an interesting point that was made is that the occupants perceived improvements or benefits were far greater than were actually proven. Clearly for some occupants there was a psychological benefit or placebo affect taking place. The last time I wrote about the proven poor performance of PIV I had damp industry salesmen stating their disagreement and commenting about how great PIV was and how they’d had a ‘masterclass,’ not just a class, but a masterclass in ventilation from someone at the BRE involved in this study but this doesn’t change the findings and we simply don’t ever specify PIV and have never needed to. Positive Input Ventilation (PIV) or Expensive Fan Heater? Passive ventilation makes use of natural forces like the buoyancy of hot air and wind to encourage airflow through your property. The result is that moist stale air is extracted and replaced with fresh clean air.

How to Reduce Condensation in a Domestic Property Using Passyfier Core Wall Vent Kits

water vapour produced in a short time scale in kitchens and bathrooms without the additional use of mechanical The unit is designed to be very unobtrusive, with a 6" (152mm) internal white plastic grill. Externally all that can be seen is a 6" white plastic external grille. The moisture vapour pressure within a dwelling is always higher than the outside pressure therefore there will always be an escape of moisture vapour by the diffusion process through the Passyfier Vent. Kill any mould that exists on the floor, wall and ceiling surfaces with a good quality fungicidal wash before redecorating (See our Mould Eradication Range). Input ventilation was found to be effective in reducing relative humidity levels by around 10%RH in the test house, even when internal doors were closed. Vapour pressures reduced overall by 0.2kPa. The unit was shown to be more effective upstairs than downstairs.

Passyfiers take advantage of the differential partial moisture vapour pressure that is normally higher inside an Insert the Passyfier Vent tube into the prepared opening, connect the internal plastic grille and the external cowl to the Passyfier vent tube, and fix to the wall surface following the manufacturer's instructions. Ensure that the vent is level and held firm in the opening. With the airtightness of newer properties and the new building regulations where new properties must pass an air tightness pressure test, extractor fans may not be suitable, they can create a negative pressure which stops them working effectively. PPU's or positive pressure units are great in summer but in winter they are forcing minus degree air into your home, this can result in freezing hall landing areas. Internal grilles in white plastic, plaster, brass & stainless steel with built in fly screens. Plastic version has extra coverage for ease of retro fitting.Until recently very little research had been done to prove the effectiveness of PIV and yet it widely specified. The BRE recently set up a parallel study to investigate the performance of PIV systems and carried out trials in their Watford test house and field studies in 16 Welsh properties. The study concluded with the following key findings: