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The experimental work described in this report was performed to provide test data for the Nuclear Emergency Search Team (NEST) Damage Limitation Working Gfoup. These tests extended our previous test results of shock absorption and aerosol filtration under transient• airflow conditions. Two types of experiments were run using two separate apparatus. Nylon fabric capture bags were structurally tested on a small shock tube similar to the shock tube used in the Phase I tests but capable of higherpressure shocks. The various filter media were tested for steady-state aerosol filtration efficiency during high pressure drops using the Phase I blowdown tube modified for thin (2.~4 em or l in.) media samples. I.