Question about Ventialtion-system....

Hi everybody. :D At the moment i think about the ventilation for my new studio. Since i don't have a aircondition inside, it's only needed to get freah air inside and the used air out of the rooms. My question is, what is better: -blow fresh air inside, or suck used air outside? - is it usefull to let the fresh air flow inside at the lower front of the controllroom, and suck the used air outside at the upper back? -or better blow fresh air from the cellig und suck used air from the groud? i can't find any imformation about this anywhere i searched until now. :oops: I hope to find a skilled person in this specialism here. :D cheers mika

Is there no knowledge about vantilation in this forum? i can't belive :shock:

Best is to make a two-way system. Suck old air out, blow fresh in. There's plenty on this forum but I agree it's hard to find. It's one of those topics that doesn't get enough attention.

So, as you deside, i need 2 fans. One for blowing inside, and one for sucking? Is there no risk of pressure difference caused of small fan speed difference? Do you have experience with the locations of the ventholes? Which is the better place (pic 1 or 2) for the ventholes? thanks for your help cheers mika :D

The location is not THAT important, you only need a room refresh of 6 times per hour or so. Low fan speed will cause less noise. Sure you can have more refreshing per hour, but it'll make it more noise-y. I'd put them both at the top of the room, doesn't matter which wall. Get a air-mechanic to advise you and sell you the right flow-control regulator, fans and pipes.

Thanks for your input ro I will use 2 small 24V fans with filter in it. I get these fans for free from my company, so it is the cheapest way for me. :P The brand of the fans is "Papst", and i know these are good fans, because papst is a good costumer from my company :D insted of stellducts i will use the cheaper effluent pipes for the long ways, with silenceboxes between outside and inside. Hope to have enough aircirculation with theses 2 fans.... cheers mika

I know Papst from COMPUTER-fans. What's your room size? Those little monsters won't give you the flowcapacity you need I'm afraid..

Thanks for reply RO Don't worry about the fans :wink: I won't use these tiny computerfans. I will use bigger fans wich are normaly build for big electrical cabinet's which we use in my company. Ist a good soultion for me, because they are for free. The recording room where i will build 2 of them inside ist about 11m², and mostly used for vocal recording. no heating ampfilers or something similar, just 1 human. For the controllroom i plan to build in biugger fans , but it is not shure wihch model. i'm still watching for find these fans also for free. Tomorrow i start to get down the old floor and walls in my new studiospace, so it will take some time before i go to the ventilation problem. The main important thing is to plan the way of the ducts before get up the new walls. any important things to think about from your side? cheers Mika

now i found a for my eyes good working Fan for the controllroom. It is also a ebm-Papst fan. It has an aircirculation about 144 [m³/h] with 38dbA and 2450 rmp. my controllroom has a roughly volume of 73 m³ so the fan can refreah the air 2 times more per hour then the roomvolume. Is it enough? cheers Mika

The minimum (clean)air per person needed is about 25m3/h. So if you have only one person in the room, when all doors are closed, you can breath about 3 hours without refresh (roughly!) Meaning your fans will do fine (atleast for one person). Roughly translated you can have about 6 people in the room with those fans. But that's a minimum. You can put a flowcontroller (read: voltage regulator) in between the fan's current supply to even lower the speed when there's only one person. Altho you can never have enough fresh air, especially(!) when that person's singing.

Ro wrote:

The minimum (clean)air per person needed is about 25m3/h. So if you have only one person in the room, when all doors are closed, you can breath about 3 hours without refresh (roughly!)

Adding to Ro wrote, that is the quantity of air to breathe. Ventilation also gets rid of body odours and gases. Andre

Adding to Ro wrote, that is the quantity of air to breathe. Ventilation also gets rid of body odours and gases.

In normal use there is only one person in the room, sometimes 3 persons for one hour more or less. how much % is need to add to the 25m³/h and human? cheers Mika

You can calculate that, see my prev post. If possible, let the fans run @ 100%. Make noisefilters (there's plenty of examples on this forum, check Lou's thread. I'm sure there's good detaild photo's of his filters). That way you'll have plenty of refresh and less noise. For one person you could set the fans on 50% without problems, depends on what he/she's doing. (how much air one needs depends how active the person is). I'd put both fans on the same regulator.

I used a Fantech 8-inch inline duct fan sucking air out of the room, with the fresh air being pulled in through another vent on the other side of the room. So with this kind of fan one fan works great. My room is 10x16x7. This fan moves a lot of air! I'm sure I could have gone with a 6-inch fan. The duct with the fan does make a little vibration noise (not airflow noise) at the moment. The duct is attached to the outer leaf and the fan is also mounted basically on the outer leaf transmitting a vibration. The duct that lets air in is silent and provides a nice breeze. I have it pointed right at my drumset to cool me off. However I don't keep the fan on all the time, just from time to time when I feel like some fresh air.

Thanks for reply Patrick. i'm going to install the ventialtionpipes tomorrow I will use 110mm pipes for the ventilation. I have seperate pipes for the CR and the LR. My fans have the same diameter like the pipes, an will sit in an excange chamber 2 meters avay from the rooms, so i have two 90 degree angels in the pipes plus a silencebox for each entrance to the room. I think/hope to go the right way with this, and be more optimistic since your post. cheers mika