Looking for fresh clean indoor air quality? Our Positive Input Ventilation range uses proven technology to cure condensation and improve your air quality. For as little as one penny per day to run, our positive input ventilation systems will ventilate your entire home. The Drimaster-Eco range is for homes with loft. The Flatmaster range is for homes without lofts. Condensation dampness is a common problem in airtight new build homes as well as poorly insulated older properties. Positive Input Ventilation (PIV) eradicates this problem by pushing fresh filtered air into the home at a continuous rate, this process removes condensation, allergens such as pollen and dust mites.