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I suspect that the thinking is for working with dry powder nanomaterials that higher lab hooch exhaust velocities would easily aerosolize the material, up the hood. If working with dry materials the lab hood's exhaust system should be fitted with a HEPA filter.
The person working with such materials should be educated about the airflow characteristics within the hood. This can be effectively done by placing a smoke bomb in the hood and having the individual mimic the powder handling. This would readily show the air's eddy currents in front of the operator. These currents can readily bring any aerosolized powder to the operator's breathing zone.
Reinhard Sidor SD
GE Global Research - Retired
Sent from my iPad
> On Aug 4, 2015, at 9:51 AM, David C. Finster
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>
> Can someone offer an explanation for the lower-than-usual flow recommendation when using nanomaterials?
>
> Thanks.
>
> Dave
>
> David C. Finster
> Professor, Department of Chemistry
> University Chemical Hygiene Officer
> Wittenberg University
> 937-327-6441
> https://urldefense.proofpoint.com/v2/url?u=http-3A__userpages.wittenberg.edu_dfinster_index.html&d=BQIFAg&c=lb62iw4YL4RFalcE2hQUQealT9-RXrryqt9KZX2qu2s&r=meWM1Buqv4IQ27AlK1OJRjcQl09S1Zta6YXKalY_Io0&m=y90GGN5CEc9Pr_2WVgV7Iw-4FSDM50IlraVESOYSr60&s=5-AUlno8fmWnamzuNqB5ofnjkIestbMYnkN01g_Nb-U&e=
>
>
>
> -----Original Message-----
> From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Ray Ryan
> Sent: Monday, August 03, 2015 10:38 AM
> To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
> Subject: Re: [DCHAS-L] Fume Hoods
>
> Luis is correct, low flow down as low as 50LFPM would be best working with nano-materials.
>
> Best regards,
>
> Raymond Ryan, CEO
> Flow Sciences, Inc
> 2025 Mercantile Drive
> Leland, NC 28451
> 910-200-4239
> rryan**At_Symbol_Here**flowsciences.com
> www.flowsciences.com
>
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>
> -----Original Message-----
> From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf Of Luis A Samaniego
> Sent: Monday, August 03, 2015 9:22 AM
> To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU