Deterministic calculators and finders. Formulas and assumptions are shown on screen, and unverified specifications are labelled rather than guessed.
Works out whether your problem calls for filtration, source control, ventilation or humidity correction — then points to the right next step.
Open tool →Required CADR from room volume and your target air changes per hour. Formula and every assumption shown on screen.
Open tool →MERV category guidance by filter size, depth and problem, with an explicit compatibility warning when your system limit is unknown.
Open tool →Replacement filter and running cost over time, using canonical filter pricing where it is verified.
Open tool →A prioritized action plan for your space — source control first, filtration where it actually helps.
Open tool →Free 8-step room-by-room clean air checklist — delivered by email. No account required.
Get free checklist →Start with the problem. If you already know you need a purifier and just need the size, go straight to the CADR calculator.
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