iRobot 621
Which parts fit the iRobot 621?
A manufacturer series-level statement covers iRobot 621 compatibility with Filter, 3-Pack for Roomba 600 and 500 series (SKU 4636450) and Roomba Cleaning Head for Roomba 500, 600 & 700 series (SKU 21917). Compatibility with Replacement AeroVac Bin (600 series) (SKU 4359682) is not confirmed; see its evidence below.
Compatibility varies by part. Being in the same series does not mean every part is shared — check each part below individually.
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Evidence (1) — verified 2026-09-14
- Filter, 3-Pack for Roomba 600 and 500 series — Official product explicitly covers both the 500 and 600 series.
iRobot's own AeroVac Bin page (SKU 4359682) gives an exact compatible-model list — 671, 676, 677, 692, 694 — and "621" is not on it, despite being sold on the "600 series" accessories page. Per this site's exact-list-over-series-name rule, we don't extend the claim just because "621" is a 600-series number. It may still fit, but that's not confirmed from this source.
Live re-fetch of the cited SKU 21633 page found only "Compatible with Roomba 500 Series robots" -- a positive series statement that never mentions the 600 series, with no "only" wording and no physical/structural difference statement. A different official 600-series bin (SKU 4359682) existing isn't itself incompatibility evidence. May still be incompatible in practice -- just not confirmed from this source.
Evidence (1) — verified 2026-09-24
- Roomba Cleaning Head for Roomba 500, 600 & 700 series (iRobot item 21917) — "For use in all Roomba 500, 600 and 700 Series models only." (official product page, item 21917; previously cited via the Roomba 600 Series accessories category page)