Pure Air Systems is the outside-air pioneer — fan-powered HEPA and carbon units that can slightly pressurize a space with filtered outside air, the closest existing concept to true positive-pressure filtration. For people with MCS, positive pressure matters: a home held at slightly higher pressure than the air around it resists the constant infiltration of neighbors’ dryer sheets, traffic exhaust, and drifting smoke. This is a short profile; the full guide is at Air Filters & Purifiers.
Pure Air Systems does something the other purifiers here do not: it brings in filtered outside air and holds your home at slightly higher pressure than the air around it.
That matters for MCS because much of what reaches you does not come from inside your house. It seeps in — neighbors’ dryer sheets, traffic exhaust, drifting smoke, pesticide spray. A home held at higher pressure pushes back against that constant leak instead of filtering it after it has already arrived. The company has been building these systems since 1985.
This is an installed, whole-space approach, not a portable box. For most people a good room purifier (Airpura, AllerAir, IQAir) is still the right first purchase; outside-air makeup is the next step if air coming in from outside or from neighboring units is your real problem.
It is fan-powered HEPA and carbon that can supply makeup air rather than only recirculating. Positive pressure forces incoming air through your filter instead of letting it leak in unfiltered through gaps and shared walls.
These are fan-powered true HEPA plus carbon, capable of makeup air and light pressurization — not just recirculating. A standard purifier ignores the unfiltered air leaking in through gaps and shared walls; positive pressure forces incoming air through your filter instead. For apartments or smoky regions, that infiltration is the exposure a room purifier never solves.
Two things. The base carbon stage is about five pounds — useful, but not a deep VOC bed — and this is installed equipment, not a plug-in unit. An upgraded media option exists, with its own caution.
The base 600HS carbon stage is a coconut pad of roughly five pounds — useful, but not a deep-carbon VOC bed; a CPZ permanganate-and-zeolite triple-blend upgrade exists, and if you choose it, mind the impregnated-media caution (a subset of MCS patients react to chemisorbent media). This is installed equipment, so it involves ductwork or a dedicated intake rather than plug-and-play. Related outside-air options in the same category include the AirScape scrubber (aluminum, MERV-11 plus H13 HEPA, around 1,200 CFM, no real carbon) and Re-Fresh outside-air makeup fans.
Outbound link to the manufacturer. We earn nothing on this page — it is provided for convenience only.
Whole-home healthy-air construction — sealing, ventilation, and material selection — is what Good Air Homes is built around. See the full context on the Air Filters & Purifiers guide and the Indoor Air Quality guide.
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