【正文】 F)No n inter v e nt ion Inter v e nt ion Outsi deDid we impact relative humidity? ?Crawl space RH stayed below 70% Expect mold suppression in crawl and reduced mold in house ?House RH was not reduced Closed crawl space + outdoor air doesn’t bring the living space to target RH Introducing outdoor air does not dry the house ?Closed crawl couples crawl RH to house ?Wallvented crawls remain coupled to outdoor RH Allergens ?Moisture dependant allergens House Dust Mite Fungus (Alternaria Alternate) ?No difference between intervention and control levels Dust Mite Allergen Levels (Control + Intervention Group) Median Der f1 ug/g dust (ELISA assay method) At MoveIn 6 months postmove in Living Room Floor Living Room Couch Bedroom Floor Bedroom Bed “Honey, Did You Pack The Dust Mites?” ?Moving from previous to new homes Only bedroom floors showed significant drop in dust mite allergen levels ?Most other allergen levels show no significant changes during next 18 months Dust Mite Levels Previous Residence vs. New Median Der f1, ug/g dust (ELISA assay method) Previous Residence At MoveIn 6 months postmove in Living Room Floor Living Room Couch Bedroom Floor Bedroom Bed Allergens – No Change from Old Home to New Median Alternaria Alternate results ug/g dust, ELISA assay method Previous Residence At MoveIn 6 months postmove in 12 months post move in* Living Room Floor Living Room Couch Bedroom Floor Bedroom Bed Are we diluting chemical asthma triggers? ?Groups very close in size ?Intervention had much tighter ducts (72%) ?Somewhat tighter envelope (25%) ?Intervention adds outdoor air intake (air cycler) to make up for loss of infiltration ventilation ?Add effective spot exhaust ?No source control House and Duct Tightness HOUSE PERFORMANCE VALUES BY INTERVENTION Status Avg duct leakage [CFM25] Duct leakage per ft2 floor Avg house leakage [CFM50] House leakage per ft2 envelope Avg kitchen exhaust [CFM] Avg bath 1 exhaust [CFM] Avg bath 2 exhaust [CFM] Intervention 34 30% 862 106 58 56 NonIntervention 122 104% 1142 0 38 37 % Diff