Useful answers.
Understand the working.
Calculators and worksheets for the subjects you study and the problems you meet in practice. Work through an example, try your own values, then test the same ideas in exam practice.
Dryer vent equivalent length worksheet
Document the actual appliance instructions used for fitting equivalents and maximum length. Keep an entered length comparison separate from a complete dryer-vent inspection.
Open tool →FREE TOOLFlue cross sectional area calculator
Compare the internal geometric areas of circular and rectangular passages. Equal area alone does not make two flues equivalent for appliance venting.
Open tool →FREE TOOLIdeal stack draft explorer
Explore the ideal buoyancy-pressure effect of height and gas temperature. Compare the simplified model with actual draft measurements and the losses it excludes.
Open tool →FREE TOOLHearth and clearance measurement worksheet
Attach appliance-specific instructions to measured minimum distances. Preserve each margin without turning a few dimensions into an installation certificate.
Open tool →FREE TOOLChimney inspection record builder
Document component observations, access restrictions and follow-up during a chimney-learning scenario. Do not infer an inspection level from a generic checklist.
Open tool →Tools that connect the calculation to the concept
Each tool shows its method, units and assumptions, together with two worked examples. Example values are for learning; replace them with your own measurements or documented inputs. The related study links take you to the matching certification topic on Chimney Exam.
Worksheets run in your browser. We do not send entered measurements or report text to a calculation service. Where export is available, you choose when to save the file locally.
Check the boundary of the answer
A useful result starts with the right inputs and an appropriate method. These tools explain what is calculated and what the method leaves out. User-supplied criteria remain identified as supplied criteria; a calculation does not automatically approve equipment, certify an inspection or establish regulatory compliance.