Bath Vent Codes: Difference between revisions
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(Created page with "*1 cfm per square foot. Not. [https://homeinspectorsecrets.com/bathroom-exhaust-fans/bathroom-fan-venting-code/] *Seed Eco-Home Floor 1 has a 5x9 bathroom = 45 sf. *Not! The c...") |
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*Not! The code requirement is a minimum of 20 cfm continuous, or 50 cfm intermittent. IRC - [M1507.4] - [https://codes.iccsafe.org/content/IRC2015/chapter-15-exhaust-systems] | *Not! The code requirement is a minimum of 20 cfm continuous, or 50 cfm intermittent. IRC - [M1507.4] - [https://codes.iccsafe.org/content/IRC2015/chapter-15-exhaust-systems] | ||
**Continuous means running 24/7 | **Continuous means running 24/7 | ||
**Code does not stipulate bathroom size. | |||
*Ducts are very specific - 3" smooth for 50 CFM is required, 3" flex is not allowed at 50 CFM Table M1506.2 [https://codes.iccsafe.org/content/IRC2015/chapter-15-exhaust-systems] - but 4" flex is allowed | |||
**'''Section M1507.2 [https://codes.iccsafe.org/content/IRC2015P3/chapter-15-exhaust-systems] covers local exhaust fans, including bathroom. It stipulates only exhaust rates, not vent material. | |||
**Does vent material matter? | |||
=Controversy= | |||
*Bathrooms with bath facilities require minimum of 80 CFM here [https://inspectapedia.com/ventilation/Bathroom_Ventilation.php#:~:text=The%20model%20building%20codes%20adopted,vented%20to%20the%20building%20exterior.]. It states pursuant to table M1507.3, which is not found in IRC 2020 or IRC 2016. Must be an older code? Yes, 2011 code, so it's outdated. | |||
**Bathroom exhaust has been updated to 50 CFM minimum in 2016 and 2020 IRC editions. | |||
*Note video shows 3" flex duct - appears to be not to code - https://youtu.be/hckMnenDU4s?t=503 | |||
Latest revision as of 01:59, 16 July 2022
- 1 cfm per square foot. Not. [1]
- Seed Eco-Home Floor 1 has a 5x9 bathroom = 45 sf.
- Not! The code requirement is a minimum of 20 cfm continuous, or 50 cfm intermittent. IRC - [M1507.4] - [2]
- Continuous means running 24/7
- Code does not stipulate bathroom size.
- Ducts are very specific - 3" smooth for 50 CFM is required, 3" flex is not allowed at 50 CFM Table M1506.2 [3] - but 4" flex is allowed
- Section M1507.2 [4] covers local exhaust fans, including bathroom. It stipulates only exhaust rates, not vent material.
- Does vent material matter?
Controversy
- Bathrooms with bath facilities require minimum of 80 CFM here [5]. It states pursuant to table M1507.3, which is not found in IRC 2020 or IRC 2016. Must be an older code? Yes, 2011 code, so it's outdated.
- Bathroom exhaust has been updated to 50 CFM minimum in 2016 and 2020 IRC editions.
- Note video shows 3" flex duct - appears to be not to code - https://youtu.be/hckMnenDU4s?t=503