[SkyHighLer]

Originally Posted by Gray Wolf

A schematic of how I built our's is attached. The front door was plexiglass framed in 3/4 plywood.

The air is exhausted through a rear plenum, with a slot at the bottom and top, and some intermediate ones.

Exhaust slot velocity is 1000 surface feet.

Makeup comes in the side and is distributed via a bottom air knife. That sweeps the heavier than air vapors into the lower slot and the upper ones pick up any lighter than air or mixed air.

Carbon filters are for smell and won't last long in an active exhaust hood. Better a tall stack with a injector cap to mix the exhaust thoroughly.

Check out Industrial Ventilation, A Manual of Recommended Practice, for design criteria, cfm and velocities.

I couldn't find a free download of that book, older editions are relatively inexpensive at eBay, but the most recent version has fan and fume hood updates.

"Since its first edition in 1951, Industrial Ventilation: A Manual of Recommended Practice has been used by engineers, regulators and industrial hygienists to design and evaluate industrial ventilation systems. Beginning with the 26th Edition, the Manual has undergone several major reorganizations and upgrades: A major reorganization into two Manuals - this Design Manual and the addition of a second compendium Manual dedicated to operation and maintenance (Industrial Ventilation: A Manual of Recommended Practice for Operation and Maintenance) Subsequent additions of chapters on organization and evaluation of systems Metric solutions and tables, and Calculation sheets and methods. Now in its 29th Edition, the Manual will include even more information on combustible dusts, nano-particles, new air control techniques and fan design information, more example problems, and more suggestions for hood designs.

https://www.amazon.com/Industrial-Ve...40_&dpSrc=srch


I did find another reference work:

Industrial Ventilation Design Guidebook, Howard D. Goodfellow, Esko Tahti

Publisher: Academic, Year: 2001

ISBN: 0122896769,9780122896767,97805 85470627


Check out FANS 9.5 & EXHAUST HOODS 10.2


Direct link to download it for free with no hassles from Library Genesis, close all other windows/tabs, and click on GET at the top of the page. The link works, use the trick in my ICMAG Signature to open it.

https://library1.org/_ads/8B6E7010E3...22AAD24C5BECD8