TinnerFlow™Measuring, Layout & Field Math
Layout marks, field measurements, offsets, allowances, drawing scale, fitting math, and cut measurements.
Measuring, Layout & Field Math questions
How do I fix a piece of rectangular duct if it's knocked together out of square?1st Year · Check firstHow do I calculate how much all-thread rod to cut for a trapeze hanger?1st Year · Check firstWhat is a "block out" in concrete, and why do we need to check them before pouring?1st Year · Check firstHow do I locate the architectural grid lines to measure out my hanger locations?2nd Year · Check firstHow do I scale a drawing if the architect forgot to put dimensions on the mechanical room?2nd Year · Stop / VerifyWhat's the formula for finding the throat radius of a standard 90-degree elbow?2nd Year · Learn / ReferenceHow do we support vertical riser ductwork at each floor penetration?3rd Year · Stop / VerifyWhat do I do if the structural beams shown on the print don't exist in the field?3rd Year · Stop / VerifyHow do I measure an offset when the duct has to drop 14 inches and move over 22 inches?3rd Year · Check firstWhat is the Pythagorean theorem (A3rd Year · Check firstHow do I take field measurements for an OG (Ogee) offset?3rd Year · Stop / VerifyWhat is "take-back" or "allowance" when measuring for a slip/drive vs. TDC fitting?3rd Year · Check firstHow do I accurately measure the diagonal of a room to make sure my main trunk is parallel?3rd Year · Check firstWhat's the formula to find the circumference of a spiral pipe when cutting a saddle tap?3rd Year · Check firstHow do I measure a canvas connector so the equipment has room to vibrate without pulling?3rd Year · Stop / VerifyHow do I draft a field sketch so the fab shop makes exactly what I need?3rd Year · Stop / VerifyHow do I handle duct that arrives from the shop fabricated backwards?3rd Year · Check firstHow do I mark out my floor penetrations before the concrete floor is poured?3rd Year · Check firstHow do I fix a branch duct tap that was laid out off center?2nd Year · Check firstHow do I fix a vertical duct riser that is drifting out of plumb?3rd Year · Check firstWhy can a flat bullnose tee cause air noise and bad balancing readings?3rd Year · Check firstWhy is a big gap around round duct through a floor slab a fire/smoke issue?3rd Year · Stop and get directionHow do you lay out a rolling offset without guessing the angle?3rd Year · Check firstWhy do parallel 45-degree offsets need different travel lengths?3rd Year · Check firstWhy should a helper deburr threaded rod after cutting it?1st Year · Field Reference