If not, prop the door open and put a small fan in there to keep the vapors down. If the window opens, I'd look at getting one of those window fans for any solvent use. It feels like being hit with a hatchet on the top of the head, a sharp thin line of pain that is usually front-to-back, not side-to-side. If you start getting a sharp headache right at the top of your head, you're building up CO2 in your bloodstream. Hobbler's idea of a rotary turbine is a good one if you live somewhere temperate. Something like this, even though it only provides 29 CFM at 0.000 static pressure, will provide more air flow at anything above 0.000 SP.

A 22 m3 shed has a lot more static pressure than a PC case. Once the static pressure goes up, the CFM will go down (aka the fan curve).

You also have to remember that PC case fans are not meant to exert any significant pressure, so they can only move 90 CFM when there is little to no static pressure. That may be enough to keep you from feeling like the air is stagnant and building up CO2 in the shed, but it's not enough to remove any significant thermal load or any significant solvent vapors. This gives you about 8 air changes per hour maximum with a push-pull vent system (one supply, one exhaust). Highest rated 120mm case fans I see on newegg are claiming 85-90 CFM, which converts to ~144.415 m3/hr in metric. On (from looking at the drawing) opposite walls. One 100mm vent at ceiling level, one 100mm vent at floor level. Let's say 18 m3 of open space (subtracting cabinets and such). If you want to post the volume of the shop, and some info on the the occupancy (what you're doing in there) I can post some info on what you need to get the proper air changes in there and some ideas on how to make it not too noisy.Ģ2 cubic meters of space. Basically your air flow (Q) will be the same, but as your area gets smaller (smaller ducts), your air velocity (V) goes up. In general, if you want quiet, you want larger ducts/vents. That is another reason that case fans would be underpowered, as they are specced for little to no pressure drop from ducts. In offices, it's a bit lower.Īnother thing to consider is that by using any ducting, you have a pressure drop as you flow through the duct. In any areas with open solvent handling, we are well above that. We shoot for 6 air changes per hour at my work in any areas we have solvents stored. If you activate these cookies, information about your use of this site can be shared with advertising and analytics partners from other sites that you are visiting.What are you doing in the shed? Crafts and Projects, or just hanging out? What are you storing in there? Is the shed insulated? How air-tight is it? Depending on these answers, your desired number of air changes may vary greatly. These cookies allow the website to personalise content and ads, and to analyse visitor traffic. These ads will also appear when browsing other websites.

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