Blower Door Samples - Actuals
Actual Formula Blower Door Variable Readings (tested)
Actual Volume
Formula Variable
(Calculated)
CFM50
60
Volume (CF)
n
Results (Calculated) 5-7 range = good
Results (Converted) Below 0.35 = mech vent req'd
ACH50
ACHn
Sample Tested House: "Tight" Habitat Pochick Ave house 8/3/12 1 story cape, move on, rehab
ACH50 ACHn
645 645
60 60
11960 11960
NA 16.7
3.236
Sample Tested House: "Tight" Hooper Farm Rd 2 story cape, modular
ACH50 ACHn
1333 1333
60 60
14903 14903
NA 13.3
5.367
Sample Tested House: "Leaky" Sunset Hill Lane 1.5 story, garage apartment
ACH50 ACHn
722 722
60 60
5250 5250
NA 15
8.251 leaky
0.550
Sample Tested House: "Leaky" Sunset Hill Main House 1 story home
ACH50 ACHn
3672 3672
60 60
19000 19000
NA 16.7
11.596 leaky
0.694
Reduction 1,821 2,089 1,821 2,376
Percentage 50% 57% 50% 65%
Variable 0.35 5.00 0.35 0.70
Req'd CFMn 110.833 94.810 110.833 77.583
Sunset Hill Main House CFM50 Air Sealing Opportunities: Standard BD Target: Get to 0.35 ACHn ASHRAE 1,851 5 ACH50 target E* Homes 1,583 BPI High 1,851 70% of ASHRAE BPI Low 1,296
0.194
0.404
Real Volumes/CFMs
38700 2317 4186 Yes
CF/hr @50p CF/hr @nat ASHRAE CF/hr @nat standard Needs Mechanical Ventilation?
79980 6014 5216.05 No
CF/hr @50p CF/hr @nat ASHRAE CF/hr @nat standard Needs Mechanical Ventilation?
43320 2888 1837.5 No
CF/hr @50p CF/hr @nat ASHRAE CF/hr @nat standard Needs Mechanical Ventilation?
220320 13193 6650 No
CF/hr @50p CF/hr @nat ASHRAE CF/hr @nat standard Needs Mechanical Ventilation?
BD reading @ ASHRAE CFM50 Standard BD reading - E* Homes CFM50 Standard BD reading - BPI CFM50 Standard - "BAS" BD reading - BPI CFM50 70% of BAS