
Asthma Triggers in Indoor Air 117
allergen levels were lower than the whole house average for all configurations, with
the high efficiency in-duct filtration performing best at minimizing the transfer of al-
lergen into the bedroom (see Figure 1B).
FIGURE 1 Comparison of Hourly Fel d 1 allergen concentrations by filtration configuration
for (1A) the whole house average and (1B) bedroom 2.