10 field-tested tips
- 1Keep waste rooms, restrooms, and mechanical rooms under negative pressure relative to the corridor.
- 2Verify exhaust fans at least twice a year — a dead fan is the #1 undiagnosed odor cause.
- 3Change HVAC filters on schedule; loaded filters bypass and become odor emitters themselves.
- 4Upgrade to MERV 13 filters where code allows — the higher rating captures more odor-carrying particulates.
- 5Add activated-carbon pre-filters to AHUs serving lobbies and guestroom corridors.
- 6Never share a return-air path between a trash room and a lobby.
- 7Balance the building yearly — pressure differentials pull odor through elevator shafts and stairwells.
- 8Seal every chase and pipe penetration; unsealed pipes are odor freeways in high-rises.
- 9Check the stack effect: cold-climate buildings pull basement odor upward all winter.
- 10Reset outdoor-air dampers seasonally; a stuck closed damper concentrates every indoor odor.
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