Which architectural product company's logo features a distinctive red triangle?

Test your knowledge of corporate identity in the architecture and building materials industry! Many architectural firms and building product manufacturers have distinctive logos that professionals in the field encounter regularly. These visual identities often reflect design principles, company values, or product characteristics. How well do you recognize these industry-specific brands that shape our built environment?

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Knauf (insulation and drywall manufacturer)
Velux (skylight and roof window manufacturer)
Armstrong (ceiling systems)
Saint-Gobain (glass and building materials conglomerate)