L&T Howden Pvt. Ltd. is a Joint Venture between Larsen & Toubro Ltd. and Howden Holdings B.V. L&T Howden is in the business of Regenerative Air-Preheaters and Variable Pitch Axial Fans (equipment, after-market spares and services) for power plants. Pvt. Ltd. is a Joint Venture between Larsen & Toubro Ltd. and Howden Holdings B.V. L&T Howden is in the business of Regenerative Air-Preheaters and Variable Pitch Axial Fans (equipment, after-market spares and services) for power plants.