Fan or simple system to add fresh air to a cellar
We had a positive pressure doofer put in to our stairwell (sounds grander than it is- social housing) because we had damp on the north east corner (again, sounds grander than it is- 2 up, 2 down) and it’s worked a treat. It just gets fresh air moving about and helps to keep things dry and it’s really quiet.Posted 1 year agofreeagentMember
To do this ‘properly’ you need to consider how many ‘air changes per hour’ you need, and specify a system from that.
Ideally you need air being introduced to the room on one side, and removed/extracted on the opposite side.
If you just blow air into the room from one side you will not get a decent spread of fresh air through the room.
Can you add a small extract point on the opposite side?
Shower fans are designed to pull a lot of air through a small pipe as their purpose is to remove damp air from the room ASAP – you are on the right track with thinking they pull too much air for your application.
If possible I’d try to fit a small fan supplying air into the room on one side, and a small extract fan opposite – this would be even better if the supply fan is down low and the extract fan up high.
I’M not sure what is commercially available to do this job, as I work on slightly bigger stuff, the last HVAC system I was involved with supplying was on here –
Posted 1 year agoblackmountainsriderMember
I used to fit a fair few of these sort or systems. They work well.Posted 1 year agowwaswasSubscriber
Shower fans are too noisy
We have a ‘silent’ extractor fan and it lives up to it’s name.
When he installed the electrician thought it wasn’t working and put his fingers in to wiggle the blades – they were turning…
It’s still near silent 5 years later.
As above, I’d suck the damp air out to the outside not push fresh in – if there’s access to the cellar from within the house the positive pressure will just force the ‘bad’ air up into the main building.
pretty sure it’s this one;
https://www.tlc-direct.co.uk/Products/SLSD100CZ.html?ad_position=1o2&source=adwords&ad_id=45425533757&placement=&kw=&network=g&matchtype=&ad_type=pla&product_id=SLSD100CZ&product_partition_id=174056526787&test=finalurl_v2&gclid=CjwKEAjw6e_IBRDvorfv2Ku79jMSJAAuiv9YNzR5p0vxXOrD9XC30icB3G1579bQUKj1DNlEILbXDxoCZ_vw_wcBPosted 1 year agothisisnotaspoonMember
Depending on the rest of the house, you probably don’t want to be drawing air from the rest of the house down into the cellar.
If the cellar is cooler, the air from the house will condense and actually make it more damp.
The ones that sit in the loft of houses work on the assumption that the air up there is dry, but warmed by waste heat from the house below (i.e. already got past the loft insulation).Posted 1 year agosharkbaitMember
If you extract damp air out it will just pull more dampness in through the below ground brickwork in the cellar rooms.
No, it will pull fresh air in from outside through the ‘natural gaps’ (proper vents would be better). The changes in air will gradually dry out the brickwork.Posted 1 year agonewrobdobMember
I need to introduce fresh air to my cellar on a constant basis, like a positive ventilation system. It’s a bit damp and musty. It has a door to the back garden (sort of a semi cellar) which when I’ve had it open for a while makes the cellar so much nicer and fresher so a nice constant flow of fresh air is proven to work well.
But what do I use? Shower fans are too noisy and I think pump too much air I think?? Need a slow moving fan which is fairly quiet
Any ideas?Posted 1 year agophiiiiilSubscriber
We’ve got a Vent-axia Tempra fan in our utility room where we dry clothes; it exchanges air via a heat exchanger and works well. It’s on the outside wall but circulates air quite well as the temperature difference, while small, means the fresh air sinks, rises up the far side and returns to the fan higher up.
There are a few similar “single room MVHR” devices; the Tempra one was the cheapest, but there are others that automatically change speed with humidity and whatnot.Posted 1 year agoSquirrelSubscriber
Cellars often have high Radon levels. Have a look here:
Either way it gives some useful info on ventilating one.Posted 1 year ago
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