Duct shell finish.
Measure the external straight or elbow shell surfaces actually receiving the finish.
Read the right quantitative data
Selected coverage, supplied coats and container volume.
Check this ordering assumption
A curved elbow coating face follows the shell path rather than its centreline projection.
The provided shell geometry does not establish airflow or fire suitability.
A worked quantity method
This illustrative set of supplied inputs demonstrates Rectangular Duct Exterior Coating Quantity Calculator. Replace the example measurements and product figures with your own before ordering.
| Supplied input | Metric display | US display |
|---|---|---|
| Supplied coat count | 1 | 1 |
| Chosen product coverage | 1 m²/L | 40.75 ft²/US gal |
| Selected container volume | 1 L | 0.26 US gal |
| Measured duct group 1: Measured exterior width | 0.3 m | 0.98 ft |
| Measured duct group 1: Measured exterior height | 0.2 m | 0.66 ft |
| Measured duct group 1: Measured coated length | 2 m | 6.56 ft |
| Measured duct group 1: Supplied exposed end faces | 0 | 0 |
| Measured duct group 1: Measured uncoated area per piece | 0 m² | 0 ft² |
| Measured duct group 1: Identical pieces | 1 | 1 |
Selected coating containers: 2 containers
- Measured coated area
- 2 m²
- Required liquid
- 2 L
Specified exterior surfaces only. Coating suitability and coat count are not selected.
Open this example in the full calculatorYour measurement and product-data sheet
Record what you know and mark verified items ready. Notes save on this browser after you edit them. Download a copy before clearing browser data.
Measure the external straight or elbow shell surfaces actually receiving the finish.
Selected coverage, supplied coats and container volume.
A curved elbow coating face follows the shell path rather than its centreline projection.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Input for Rectangular Duct Exterior Coating Quantity Calculator. Record the value with its unit and quantity basis.
Choose your next calculation
Rectangular Duct Exterior Coating Quantity Calculator
Measure four exterior duct faces and only the supplied exposed end faces, then deduct known uncoated area.
Supplied Round Elbow Shell Coating Quantity Calculator
Calculate curved lateral area of a specified circular elbow for coating quantities, excluding end faces.
Turn the estimate into an order
- Confirm that all quantities use the same measured basis and the selected product's current data.
- Keep different products, finishes and handed variants in separate purchase lines.
- Review exact demand and whole-pack purchase quantities before entering your quoted prices.
- Record compatible stock already on hand, then save the remaining order in your browser project.
Measurement and purchase guides
Other materials in this family
Reviewed 6 October 2026. Geometry and purchase arithmetic use your measurements and selected specifications. Calculation scope.