Ventilation vs Infiltration vs Manual J This webinar discusses ventilation and infiltration in buildings and building envelopes. It also explains Manual J (calculations to determine the heating and cooling load for the building) and discusses ventilation and infiltration in that context. Architects and designers,Building department personnel,Mechanical, electrical, and plumbing engineers building envelopes,HVAC sizing,infiltration,Manual J,ventilation Related Videos 1:14:34 Blower Door and Duct Leakage Testing 1:20:17 Interconnection of Vapor and Air in Walls 1:00:19 Heat Pump Installation