How often do I need to calibrate my air infiltration test kit?
Every 6 months:
(The ASTM E 783 refers to AAMA 204-98 page #4 FIG.1 for dimensions and guidelines of the field calibration box).

ASTM E 783-02 “Standard Test Method for Field Measurement of Air Leakage Through Installed Exterior Windows and Doors” Page #4 Paragraph 12.1 “All test apparatus shall be calibrated at a minimum of every six months”.

CLICK HERE to see the RM Group’s calibration box, now available.