Exhaust Flue Calculator

Calculate exhaust flue diameter, draft hood size, and BTU venting capacity from appliance BTU input, flue height, and connector type. Runs locally in your browser.

BTU input

BTU/hr

Flue height

Connector type (1=single,2=double)

1 or 2

Enter values to calculate.

All calculations run locally in your browser — nothing leaves your device.