Bruce, Very good point about the air flow being significantly above a standard hood face velocity. Your point is backed up by the ACGIH's Industrial ventilation: a manual of recommended practice. It requires 100 f/m for a standard spray booth unless they are spraying something like lead-bearing ceramic glazes when the number jumps to 400 f/m.
From: Bruce Van Scoy <bvanscoy**At_Symbol_Here**TWC.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Fri, Dec 8, 2017 5:28 am
Subject: Re: [DCHAS-L] ? re Lead Acetate
Sent: Thursday, December 7, 2017 8:16 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] ? re Lead Acetate
A system of local and/or general exhaust is recommended to keep employee exposures below the Airborne Exposure Limits. Local exhaust ventilation is generally preferred because it can control the emissions of the contaminant at its source, preventing dispersion of it into the general work area. Please refer to the ACGIH document, Industrial Ventilation, A Manual of Recommended Practices, most recent edition, for details.
Personal Respirators (NIOSH Approved):
If the exposure limit is exceeded, a half-face high efficiency dust/mist respirator may be worn for up to ten times the exposure limit or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. A full-face piece high efficiency dust/mist respirator may be worn up to 50 times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. For emergencies or instances where the exposure levels are not known, use a full-facepiece positive-pressure, air-supplied respirator. WARNING: Air-purifying respirators do not protect workers in oxygen-deficient atmospheres.
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