Fan & Duct Sizing Calculator / Value-Added Services / Online Tools / Ducts with cross-sectional length greater than 1,200mm are recommended to be split into two or more ducts, whereever possible. The proposed duct sizes are for the cross-sectional dimensions of the ducts as the linear length is determined by location of the room(s). Disclaimer The online calculators are to generate queries only, we recommend working with experts to ensure suitability; if you are unsure or would like assistance analysing your current setup or application, feel free to contact us with your questions for professional advice from one from our experts. Nehmeh assumes no responsibility or liability for any errors or omissions using these online calculators. These online tools are guides and do not constitute as professional advice. View ourVentilation Solutions Check out more online tools Universal Converter Powerful universal unit converter Power Calculator Power & Consumption calculator Air Flow Converter Calculator for HVAC & pneumatic tools Fan / Duct Calculator Get draft proposals for duct sizing Water Flow Volume & Flow Rate Converter Service Tracker Track service live Service Booking Easy service online booking Health Check Health Audit Booking RAL Colors RAL Classic Colors System Nehmeh E|Learning Never stop learning OurCatalogs Access all the catalogs OurApps Mobile Apps