<< Return to Previous Page Lead Pot and Dross Hood ![]() Text Version Lead Pot and Dross Hood Lead pot with dross pot and hood. Keep work openings as small as practical. Doors advisable. Door for dross pan removable. Design Criteria: Q = 100 - 200 cfm/ft2 of opening plus volume of products of combustion.* Duct velocity = 2,000 - 3,500 fpm for fume only. Duct velocity = 4,200 - 4,500 fpm for transport of dust and fume.** Entry loss = 0.50 VP * Correct for temperature ** For horizontal runs, transport velocity is necessary. Note: Separate flue required if combustion gases are not vented through the hoods. |