Section Env-A 1805.05 - Work Area Ventilation(a) The work area shall be served by a sufficient number of negative pressure ventilation units with HEPA filtration to provide one containment area air change every 15 minutes.(b) The unit(s) shall be operated to maintain a static pressure differential of 0.02 inches water gauge from the time that barrier construction is completed through the time acceptable final clean air monitoring results are obtained.(c) The negative pressure ventilation units shall exhaust filtered air to the outside of the facility wherever practical.(d) If exhausted to interior spaces, the exhaust shall be monitored for fiber release by: (1) Using a continuous, direct reading instrument equipped with a chart recorder located at the exhaust; or(2) Taking daily air samples at the exhaust and having them analyzed using one of the techniques specified in Env-A 1808.03, as expeditiously as practical but no more than 24 hours after sampling.N.H. Admin. Code § Env-A 1805.05
(See Revision Note at chapter heading for Env-A 1800) #9298, eff 10-21-08
Amended by Volume XXXVII Number 19, Filed May 11, 2017, Proposed by #12172, Effective 5/5/2017, Expires 5/5/2027.