Harman Stove Company Accentra Service Training page 20

Draft Testing
All Harman pellet units have a test port on them for checking the draft.
There is a draft meter kit available from Harman Stove Company, which also
includes a digital multi-meter. This draft meter includes a bolt-type fitting
to attach the meter to the stove.
Taking a draft reading before installing the venting will give you a reference point
to shoot for after the stove is vented. Lower readings after installation indicate
possible restrictions in the venting.
Item # 1-00-00637
Harman Pellet Service Training 20