Exhaust hood ideas for test tanks

[johnyrude200]

Hi All,

I relocated my test tank from next to the garage door, to the rear of the garage next to a window facing away from my neighbor to be respectful and cut down on the noise level now that we’re >approaching< warmer temperatures. I was wondering if folks could post some pics of vent hoods they built to help pull exhaust gases from their tanks. I have a 300-gallon tank on a custom made frame with castors, right next to a typical residential double-hung window. I was thinking a dual 9" blade fan with a hood would provide adequate air flow.

Thanks again for the help!

J

[Goman]

Check with companies that service your local hospital or nursing home kitchen range hood systems. From what I’ve seen they trash whatever during upgrades.

[johnyrude200]

Now THAT, is a GREAT idea.

[frankr]

At the shop where I used to work, we obtained a large, used, "squirrel cage" fan from an air conditioning contractor. Those things move a huge amount of air without sounding like a B-29. The AC people throw them in the dump all the time, so the cost is nominal.

[ddoyle]

You will be surprised how much fan it takes to move the volume of air that runs thru an engine. Do some simple calcs basted on cylinder volume and RPM. On the outlet side of your system my guess is that you wont get satisfactory results going straight out the window with out some sort of stack to combat any little breeze that blows the wrong way. Like FrankR says you need to move a HUGE amount of air.

[shoestringmariner]

Got photos of your tank in use? I’d say you’re looking at a BI Wheel (backward incline) general exhaust fan if you want enough draw. You may have to fashion a 3 sided hood with pick up tubes on each side of the tank, near the water to draw off the fumes. The wider the tank, the more flow you need to introduce. A long, narrow slice in the duct will help, or better yet, make adjustable dampers to tailor your draw

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