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Thanks. Looking at doing the "One-permanent opening method" as described here. This will help with grade issues. Chapter 24 - Fuel Gas

Might sound elementary and if it does, I apologize. But remember to take the thickness of the blade into account. If you measure and draw a line be sure to measure again to determine where on the line you should cut. If you cut on the wrong side, you will be probably at least an 1/8" off. This...

Background: I am planning to wall off my mechanical area which will create a confined space, according to code definitions of < 50cu.ft. / 1kBtuh. Free advice from a HVAC pro acquaintance suggested putting grills on the new wall. However, I would have to vent two walls to make up the required...