A LOTUS Smoke Blocker will Pressurize a Breathing Zone with HEPA and Carbon-Filtered Outdoor Air to Block Entry of Outdoor Smoke Through Cracks in a Building's Exterior Pressure Envelope. A home needs to be sufficiently air-tight (energy-efficient) to allow pressurization. Exhaust ventilation system operation will "suck" smokey outdoor air into a home. Never use any exhaust ventilation systems during wildfire smoke periods. HEPA / Carbon-filters will remove 99.97% of particles as small as 0.3 microns and a substantial portion of the gas components so that one room, a section or the whole home can be made a "Nearly Smoke-Free Sanctuary" for occupants.