Condensation problems Positive input ventilation help please.

mazziee

I phoned Nuaire today and although they don't have recommended installers, they gave me a number of someone local ish. Although they weren't themselves able to help, they gave me a local electrician's no who has exp of fitting. Quoted £160 to fit and I've ordered the system myself. So worth calling Nuaire to see if they can do same for you

tacpot12

I have cured the mould problem in two properties now with a extractor fan and remote tamper-resistant humidistat. The trick is to wire the fan so that it can always be switched ON by the humidistat, and only ever switched ON by people, never OFF. The humidistats are about £60. One of the properties is tenanted and required trickle vents fitting. The trickle vents were modified to prevent them being closed. The trickle vents were £6 each off eBay and took about an hour to fit.

Could you fit an extractor fan in the wallspace about the bathroom door so that it sucks air from the hallway and creates a positive pressure in the bathroom? Add non-closable trickle vents to the windows and you have a discreet positive pressure system to push moist air out the bathroom. Mount a remote humidistat in the area of the room that receives the least airflow and the fan will keep running until the entire bathroom is dry.

I built a small duct system using rectangular uPVC duct (equivalent of 100mm dia) to pull damp air from where it was being created, by the shower, to where the extractor fan was fitted. The duct and accessories are very cheap from Screwfix and Toolstation. You could do the same in reverse to deliver dry air to the harder to reach areas of the bathroom.

You need to find a solution because it will cause a rapid deterioration.

Mahsroh

mazziee wrote: »

I phoned Nuaire today and although they don't have recommended installers, they gave me a number of someone local ish. Although they weren't themselves able to help, they gave me a local electrician's no who has exp of fitting. Quoted £160 to fit and I've ordered the system myself. So worth calling Nuaire to see if they can do same for you

Perfect! Thank you - i'll call them later!

SuzieSue

Envirovent have their own installers:

http://www.envirovent.com/specifier/rapid-response/

alejamruc

We had incredible results from a positive input ventilation system.

In the winter we had water condensing in thick droplets on windows, pooling on window sills and even dripping down walls in our bathroom (which is a bit out on a limb, so has more exposed walls and loses heat quickly).

The day after installing ours it was below zero, but there was not a hint of condensation on our windows. I was shocked and thought it was a fluke, but after a couple of months I am entirely sold on these.

We have even got clever at directing the air flow by closing certain doors and opening other. So, when having a hot bath, we close all other doors, turn the bathroom extractor on and leave the bathroom door open. We now don't even get a mist on the bathroom mirror, let alone dripping walls.

Also no more problems with black mould on external walls behind furniture where there was poor airflow.

We bought a Nuaire system but installed it ourselves (saving about £600 on a damp company's quote. They are genuinely very simple to install and there are how-to installation videos on YouTube. If it looks too much for your ability, then an electrician should be able to install it in 1-2 hours for way less than a damp company will quote.