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Room ventilation and extraction systems Guidelines

All WCT system have ventilation system that exhausts air from the composting chambers to maintain a healthy compost and odour free use.

Most WCT system will have ether an electric or passive composting ventilation system and these are a necessary part of their designed air-flow dynamics and code requirements.

It is important to note that with the use of a WCT system you should never override the ventilation system dynamics  with a counter flow of air from extractor units, home ventilation systems or heavy natural drafts.

In accordance with the building code, it is standard design practice to use one of the following means of ventilation for bathrooms and toilet rooms:

  • Electric extractor units, often through the wall or inline
  • Passive wind driving ventilation, turbo vents or convection currents
  • Passive ventilation through windows and skylights
  • Home ventilation and central heating systems.

All of the above may or may not be a problem for composting systems and their inherent ventilation systems.

Extraction systems and their suitability

Electric extractor

Standard extractor systems are designed to suck air out of a room and blow the air outside where it is dispersed. This is counter intuitive in relation to the use of a WCT system as the extraction unit will be fighting against the composting ventilation system flow, so that it may create a back draft that could leave the room with unwanted odours. 

Note: it is possible to use these types of systems if the airflow is half that of the composting ventilation system and provision is made for ease of point of entry of fresh air in to the room.

Passive wind driven ventilation, windows and skylights ventilation

Passive wind ventilation is good for energy savings but with heavy winds can create a powerful negative pressure in room, so much so that this will override the composting ventilation system. The same applies for window and skylight ventilation, as with heavy winds this can lead to backdrafts resulting from negative pressure building up from around the house on the leeward side and can be enough to override the composting ventilation system.

Note: if these types of ventilation are to be used please consider the windward flow and provisioning of the toilet and bathrooms. This may not be possible in a renovation.

Home ventilation and central heating systems.

These systems very greatly in their design and can be modified to suit WCT system. In general, these systems are designed to extract air from the bathroom and toilet rooms, but the system suppliers can modify them to blow air into the rooms creating a positive pressure and this not affect the WCT system if the pressures and air flows are not too high.

Notes: these types of system can be heated and that will benefit the WCT systems in the colder climates of New Zealand. See our climate chart here (link)

Waterless Composting toilets prides itself on providing the best advice and solutions to achieve the best performance and user experience from your WCT system - that is why have searched far and wide to find the best products. We have chosen the best technology that in all situations will archive a perfect relationship between your WCT system and the need for room ventilation while maintaining heat energy at no extra cost.

Please see our WCTNZ approved ventilation system here (link)

For advice on how to achieve Passive House Design requirements with a WCT systems see here (Link)