Table A1.

Results of filtration experiments in an unoccupied furnished bedroom.

Source	PNC Reduction (%) a,b
	Sham filter	HEPA filter
None c	14 ± 5.8	85 ± 3.6
Low concentration, continuous d	12 ± 5.6	74 ± 11
High concentration
Discrete (candle, just after being extinguished) e	83 ± 0.84	95 ± 0.41
Continuous (a burning candle) f	−32 ± 4.3	−13 ± 7.5

Notes: ^a PNC reduction was measured as the difference in PNC averaged over the 30 min prior to HEPA being turned on and PNC averaged over the 10–40 min after HEPA was turned on. For the discrete source, PNC reduction was measured as the difference in PNC averaged over the 30 min prior to HEPA being turned on and the average PNC over the 10–40 min after the source was turned off; ^b Mean ± standard deviation (SD), n = 3 (except for sham filter with no source where n = 2); ^c None = no candle; windows closed; ^d Window was opened 70 cm (area of opening was 2800 cm²) allowing ambient air to enter the room and serve as a continuous source; ^e Measurements were performed with HEPA running continuously before and after the candle was extinguished. For the case where the HEPA was turned off (no HEPA or sham filtration), PNC in the room decreased to 77% ± 0.62% after 30 min. Between 400–600 min after the candle was extinguished, PNC reduction due to HEPA and sham filtration were 99.99% ± 0.0072% and 99.42% ± 0.13%, respectively; ^f Measurements were performed with candle burning continuously before and after the HEPA was turned on.