Appendix B: Calibration, Maintenance, and Care
82
January 2022
BlowerDoor Standard
To find the actual air flow, use the formula provided by the manufacturer:
airflow
measured
(m³/h)
= airflow
reading
(m³/h)
∙
1.204 kg/m³
Air density (kg/m³)
*)
*) Density of the air that flows through the fan. With negative pressure in the building, that is the
density of the inside air. With positive pressure in the building, that is the density of the outside air.
Note:
TECTITE Express, the accompanying program, corrects the airflow automatically.
Calibration
We recommend that the fan be recalibrated every four years. Contact our office for more information.
With the exception of damage, the fan should retain its factory-set calibration settings between the
recommended calibrations. Damage may include damage to the flow sensor, shifting of the motor or
blades within the fan housing, damage to the housing itself, and leaks in the tubing or flow sensor.
Periodically check the fan for damage.
Range of ring
Ring
Min. fan pressure
(Pa)
minimum
air flow
(m³/h)
maximum
air flow at 50 Pa
(m³/h)
Open fan
25
3549
approx. 7200
Ring A
25
1345
approx. 3900
Ring B
20
362
approx. 1600
Ring C
15
78
approx. 430
Ring D
15
48
approx. 190
Ring E
15
19
approx.
70
The fan is calibrated to a pressure differential of up to 80 Pa, but can be calibrated to differentials of
up to 100 Pa. To do this, the data points must lie on the line of best fit.
