22/09/2026
Your nose can't smell the problem until it's twice as bad.
Ammonia starts affecting a horse's lungs at around 10 ppm.
Humans can only smell it at around 20 ppm.
So by the time a stable "smells like a stable", it's already over the line.
We put together the measured numbers on stable ventilation — what the recommended air change rate actually is, why bedding alone can't fix it, and the six questions worth asking before you specify a stable.
Ventilation is a build decision, not a cleaning decision. Ridge vents, open stall profiles, cross-flow down the aisle — the JHorse stable detail pages show how each is drawn to keep air moving where the horse is standing.
Full specs and airflow detail → https://www.jhorseequine.com/DoorWindow_list.html