Allergies anyone?

In eHaus News, Passive house, Ventilation by eHaus6 Comments

It is interesting to note especially as we move into Spring, that pollen and dust mites are no longer a feature in a passive house.  This is a huge factor when deciding how to build your new home – especially if you or a family member falls victim to the ever present allergies that particularly manifest themselves around this time of the year.  A Passive House is a healthier house that controls dust and pollen associated with hay fever and other allergies. A Passive House controls humidity, eliminates mould and condensation which is associated with asthma and other respiratory illnesses.

Based on recent research, the ten most common causes of allergies are:spring_allergies

  • Grass Allergens
  • Dust Mite Allergens
  • Weed Pollens
  • Tree Pollens
  • Cat Allergens
  • Dog Allergens
  • Indoor Mould Species
  • Cockroach Allergens
  • Rodent Waste Allergens
  • Outdoor Mould Species

With the specific building requirements that eHaus undertakes during construction,  most of these causes are eliminated with the installation of the highly efficient heat recovery unit.  This unit cleans and circulates the air in a room providing fresh pollen-free and dust-free air once every three hours and does not release ozone back into the air from the filtration process.   This maximises comfort for everyone, especially for those with allergies or respiratory problems.

It is definitely worth investigating if you are considering building and want to eliminate these factors from your living environment forever!



    1. Hi Kate
      The maintenance on the system is simply replacing the filters on the unit (clients do this themselves). There are two to replace yearly and the cost for two is about $75.00.

      Kind regards
      Glenda Brown

  1. Hi there
    Upon searching heat transfer systems there seems to be a few available. Do you have a preferred one?
    If so what is it and where do you buy it from?
    What brands are suitable and what systems do you stay away from?

    1. Any system that is Passive House certified is good to go. There is a list of all the options on the Passive House product database. Our normal option is Zehnder sourced from Fantec a local company here in NZ

  2. With installation,and to achieve an acceptable standard do you put the thickest batts available plus a thermal blanket over them or do you put average batts plus thermal blanket.
    Is there is such a thing as too much insulation?
    That is the basis of my question..

    1. Hi Kevin, thanks for your question. We use the PHPP energy modelling tool to tell us for each specific design how much insulation is required. This is critical because there are 18 climate zones in New Zealand each requiring a difference combination to get the right overall performance. Is there is such a thing as too much insulation? Yes, when we are completing the energy modelling we can clearly see that adding more insulation to say a wall has no significant impact. In this way we are able to create a perfect balance and not over specify.

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