Ventilation

[sickboyshadow]

Hi Guys

Looking for a little advice, my new hot tub will be installed next week. It is a 2m x2m tub and will be placed in a 10' x 12' Summer House.

The summer house has no windows that open and with the doors shut it will soon be full of condensation and go mouldy etc

I am looking to fit some electric fan vents and am led to believe i need one that blows in and one that sucks out. This is to create a circle of venting.

Im really asking if this is correct but mainly what size extractor vent would i need ?

Any help would be apreciated

Lee

[Vinny]

What you need is cross ventilation.

Place the fan at the highest place and vents around the lowest place (1 on each wall - maybe 6 in x10 in) and you should be fine. A 10x12x8 room is 960 cubic feet so a 120 CFM or larger fan should work ok. If you can install a timer - even better. With that size fan you will get approximately 7.5 air exchanges an hour [(120 CFM x 60 min)/960 cubic ft]. If the fan is on a timer it makes t easier to vent the room while you're not there and when you need to add a lot of chemicals (shocking). Set the timer for an hour or so before you get in or for 1/2 hour or so for when you get out and it should work ... if need be adjust the time for longer ventilation (1 hour is max on my timer). I have used Fantech fans in my bathroom renovation and they are a quality item and would recommend them to anyone; I have attic mounted but I would imagine they all are quality pieces.

As a FYI, I have a 110 CFM fan in my bathroom and my showers tend to be hot. With the fan running I may get a little condensation on the mirrors while I shower with the door closed and only 1 6x10 vent (forced hot air) but as soon as the shower is over the mirror clears up within 3 minutes and once the door is open it is almost instantaneous. I can actually feel a draft when I open the shower door to get out.

I am not in the HVAC business but think that this is a good enough solution to this problem.

[sickboyshadow]

Now that's what i call an answer !!

[Dr. Spa™ Ret.]

Forget the timer, I'd go with a Dehumidistat

http://www.homedepot.com/p/Broan-Dehumidistat-Wall-Control-in-White-DH100W/203504318

http://www.supplyhouse.com/Fantech-FH20-FH20-Dehumidistat-Wall-Mount-115V-10A?gclid=CIuyoJOtl8MCFQphfgodxVgApg

[Vinny]

Forget the timer, I'd go with a Dehumidistat

http://www.homedepot.com/p/Broan-Dehumidistat-Wall-Control-in-White-DH100W/203504318

http://www.supplyhouse.com/Fantech-FH20-FH20-Dehumidistat-Wall-Mount-115V-10A?gclid=CIuyoJOtl8MCFQphfgodxVgApg

Yeah, I wasn't thinking about a dehumidistat, that would probably be a little better assuming it's not too humid outside!

[Dr. Spa™ Ret.]

That's an interesting point. If the dehumidistat is set below ambient humidity, it'll never turn off.

[sickboyshadow]

Well here in the UK it is never to humid, so should not be to much of an issue. Once i find ambient humidity