Bathroom Vent Duct Code

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.

Bathroom vent duct code. Bathrooms must have windows. The maximum length of the exhaust duct shall be 35 feet 10 668 mm from the connection to the transition duct from the dryer to the outlet terminal. Where fittings are used the maximum length of the exhaust duct shall be reduced in accordance with table m1502 4 5 1.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. You can have it almost anywhere on the ceiling or wall floors are forbidden due to possibility of vent flooding. Bathroom exhaust fan venting code summary section r303 3.

This is usually considered much more important from a code standpoint than removing odors. The model building codes adopted by most jurisdictions typically require bathroom ventilation to be provided either by an operable window 3 sq. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. Well there s no specific building code requirement for the bathroom vent location exhaust fan installation.

The basic intent of bathroom ventilation codes are to remove moisture laden air from a bathroom to the exterior of the home. The maximum length of the exhaust duct does not include the transition duct. Or greater or by mechanical means a bathroom vent fan 20 continuous or 50 cfm intermittent vented to the building exterior.