This document provides a complete guide for performing fluorescent leak testing on baghouse dust collection systems to identify leaking filter bags, damaged tubesheets, faulty seals, and other sources of particulate bypass. It explains the purpose and benefits of leak testing, outlines the proper injection and inspection procedures for tracer powder testing, and includes recommendations for selecting the appropriate leak detection powder color based on the application. The guide also covers best practices for operating leak detection powders, inspecting collectors with UV lights, and differentiating between actual leaks and normal filter bleed-through. In addition, the document contains a step-by-step worksheet for calculating the amount of leak detection powder required based on total filter cloth area, using the standard guideline of one pound of powder per 1,000 square feet of filter media. This resource serves as both a maintenance instruction manual and a practical planning tool for facilities performing routine baghouse inspections.