I have an Victorian style house built in in the 1900's. Unfortunately being an older house, i do tend to get moisture problems and the only way the house gets a breeze is through these tiny 10cm x 20cm floor vents (everything is blocked up, not like other homes on stumps where a breeze can run freely across). I've installed underfloor vent fans Quad Fans - Envirofan Sub-Floor Ventilation Solutions, Sydney - Reduce Mould - Prevent Termites several years ago and that hasn't done much, the ground is still constantly damp. I'm thinking of going out to bunnings and buying the following Dynabreeze 30cm Yellow Extraction Fan with a hose Dynabreeze 5m Extraction Fan Hose. Very much aware that these things aren't going to be quiet, however I only intend to run this every so often (while I am out at work etc). I'm either going to: 1. Put the entire thing under floor and run it for several hours at a time (I'll use a timer or something to give it a break) 2. Connect it to the house and feed that under the house. The fan itself will then remain above the floor. Is there anything i can potential break? Surely during up the ground is better than having it damp. Thoughts?