Development a one exhaust hood

Development-pattern a one exhaust hood inna di shape a one truncated pyramid

X - Width a di bottom base.
Y - Height a di pyramid.
F - Upper base length.
E - Width a di top base.
G - Di length a di side face a di pyramid. Apofema.
U - Di angle a inclination a di pyramid.

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Di calculator allow yuh fi calculate di parameters a one tetrahedral truncated pyramid wid a rectangular base. Dis is useful fi calculate exhaust hoods fi ventilation, a hood fi a kitchen or barbecue, or an hood fi a chimney pipe.

How fi use di calculation.

Select di dimensions by which di calculation ago be mek. Gi di dimensions an angles a di pyramid weh yuh know. Click di Calculate button. As a result a di calculation, drawings a di cap pattern dem generate.
Di drawings dem show di dimensions a individual parts fi di pattern a one truncated pyramid.
Drawings are also generated: front view an side view.

If di size a E is equal to di size a F, den deh ago have a regular truncated pyramid.
If di dimensions dem a E=0 an F=0, den deh ago have a regular pyramid.

As a result a di calculation, yuh can find out:

Di angle a inclination a di pyramid, if it neva know.
Cutting angles pan di development.
Di area a di top an all side surfaces.
Surface area a di bottom base.
Volume a di pyramid.
Workpiece sheet dimensions.

Attention. No figet fi add allowances fi di folds fi connect di parts a di hood.