Class I inspections are routine (not exceeding 2 years), visual inspections, using binoculars or spotter scope from the ground or any close vantage point.

It is best to perform a Class I chimney inspection during shut-down to allow access for a full-height inspection of the liner and annular space. While the chimney is off-line a close-up visual inspection can be made of sections of the chimney accessible by all permanent access components, ie: ladders, platforms.