This air duct calculator "wizard" wheel is one of our most requested duct design calculators.
On side 1, perform standard industry calculations.
Side 2 shows drawings and sizes for commonly used fittings and connections.
Punched to fit a 3 ring binder.
Size: 8.5" x 11" card with a 7.25" wheel.
Material: Heavyweight calculator board

New products from manufacturers at wholesale prices