iRobot Roomba · s9 · filter
All sourced parts
s-series is its own filter family.
Official source
s9 is a separate parts ecosystem from e/i/j.
Official 4643682 lists Roomba s Series only.
Official e/i/j filter 4639161 does not list s Series.
Official 4636433 is 800/900 AeroForce only, not s Series.