ORSC, Section M1506.4 requires exhaust fans to be vented directly to the outside. Can the vent terminate at a bird block or does it have to have its own vent through the roof?
Yes, it may terminate at a bird block, but the vent pipe must be extended to the exterior of the building and shall terminate past the bird block to the very outside of the building envelope, with some sort of positive connection (or boot) to prevent the moist air from easily re-entering the attic. Just “getting close” for this type of application is not acceptable.
Related Questions
- ORSC, Section M1506.4 requires exhaust fans to be vented directly to the outside. Can the vent terminate at a bird block or does it have to have its own vent through the roof?
- Is the exhaust vent or outside exhaust hood clogged with lint and restricting air movement?
- Do I need to vent my cooktop or range to the outside?
