Found this recently. Is this considered acceptable for bathroom ventilation? There is a gap between the end of the duct and the screen of about 2 inches.
No…
Irc 303.3
Close only counts in horseshoes.
And grenades.
Kind of like this one. I also see the second pic alot around here, they smash them closed just to stick them in. I think you can get the proper flashing for something like $5-$10.
I believe someone misquoted the correct section in the IRC.
The original question was about bathroom ventilation, it was not about appliances or vented room heaters.
G2406.2 (303.3) Prohibited locations. Close, but no cigar! :roll:
Appliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one of the following:
- The appliance is a direct-vent appliance installed in accordance with the conditions of the listing and the manufacturer’s instructions.
- Vented room heaters, wall furnaces, vented decorative appliances, vented gas fireplaces, vented gas fireplace heaters and decorative appliances for installation in vented solid fuel-burning fireplaces are installed in rooms that meet the required volume criteria of Section G2407.5.
- A single wall-mounted unvented room heater is installed in a bathroom and such unvented room heater is equipped as specified in Section G2445.6 and has an input rating not greater than 6,000 Btu/h (1.76 kW). The bathroom shall meet the required volume criteria of Section G2407.5.
- A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section G2445.6 and has an input rating not greater than 10,000 Btu/h (2.93 kW). The bedroom shall meet the required volume criteria of Section G2407.5.
- The appliance is installed in a room or space that opens only into a bedroom or bathroom, and such room or space is used for no other purpose and is provided with a solid weather-stripped door equipped with an approved self-closing device. All combustion air shall be taken directly from the outdoors in accordance with Section G2407.6.
G2406.3 (303.6) Outdoor locations.
Equipment installed in outdoor locations shall be either listed for outdoor installation or provided with protection from outdoor environmental factors that influence the operability, durability and safety of the equipment.
Here is the correct answer.
M1506.2 Recirculation of air.
Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted directly to the outdoors. Exhaust air from bathrooms and toilet rooms shall not discharge into an attic, crawl space or other areas inside the building.
and Nukes :mrgreen:
You’re awesome Frank, no doubt…
But around here I’ve called out flexi ducting that terminated within the attic and was told by the AHJ’s in 2 of the 3 counties I run in that (paraphrasing) “If it is within 36” of the ridge vent, that’s better than overboard thru a soffit"…
Thinking about the thermodynamics of heat (rising in an attic coming in from a soffit) and it’s hard to keep arguing…
my .02
Hey sparky, I would check your sources.
Code Requirement:
Minimum ventilation for the bathroom is to be a window of at least 3 sq. ft. of which 50% is operable, or a mechanical ventilation system of at least 50 cubic feet per minute (cfm) ducted to the outside. IRC R 303.3,
I guess it would be silly of me to look at “residential” code…:roll:
Ducted to within 3 or 4 inches of outside is NOT ducted to the outside.
HERE YA GO!
The 2006 International Residential Code for One and Two Family Dwellings
Definition:
ENVIRONMENTAL AIR. Air that is conveyed to or from occupied areas through ducts which are not part of the heating or air-conditioning system, such as ventilation for human usage, domestic kitchen range exhaust*, *bathroom exhaust and domestic clothes dryer exhaust.
IRC, Section Are 303, Light, Ventilation, and Heating.
R303.3 Bathrooms.
Bathrooms, water closet compartments and other similar rooms shall be provided with aggregate glazing area in windows of not less than 3 square feet (0.3 m2), one-half of which must be openable.
Exception: The glazed areas shall not be required where artificial light and a mechanical ventilation system are provided. The minimum ventilation rates shall be 50 cubic feet per minute (24 L/s) for intermittent ventilation or 20 cubic feet per minute (10 L/s) for continuous ventilation. Ventilation air from the space shall be exhausted directly to the outside.**
IRC, Chapter 15, SECTION M1507, MECHANICAL VENTILATION
M1507.1 General.
Where toilet rooms and bathrooms are mechanically ventilated, the ventilation equipment shall be installed in accordance with this section.
M1506.2 Recirculation of air.
Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted directly to the outdoors. Exhaust air from bathrooms and toilet rooms shall not discharge into an attic, crawl space or other areas inside the building.
M1507.3 Ventilation rate.
Ventilation systems shall be designed to have the capacity to exhaust the minimum air flow rate determined in accordance with Table M1507.3. Mechanical exhaust capacity of 50 CFM intermittent or 20 CFM continuous
2006, International Mechanical Code
502.18 Specific rooms.
Specific rooms, including bathrooms, locker rooms, smoking lounges and toilet rooms, shall be exhausted in accordance with the ventilation requirements of Chapter 4.
2006, International Property Maintenance Code
Definition:
BATHROOM. A room containing plumbing fixtures including a bathtub or shower.
Chapter 4, Light, Ventilation, and Occupancy Limitations
SECTION 403, VENTILATION
403.2 Bathrooms and toilet rooms.
Every bathroom and toilet room shall comply with the ventilation requirements for habitable spaces as required by Section 403.1, except that a window shall not be required in such spaces equipped with a mechanical ventilation system. Air exhausted by a mechanical ventilation system from a bathroom or toilet room shall discharge to the outdoors and shall not be recirculated.
**403.4 Process ventilation. **
Where injurious, toxic, irritating or noxious fumes, gases, dusts or mists are generated, a local exhaust ventilation system shall be provided to remove the contaminating agent at the source. Air shall be exhausted to the exterior and not be recirculated to any space.
2006 International Plumbing Code
Definition:
BATHROOM GROUP**.** A group of fixtures consisting of a water closet, lavatory, bathtub or shower, including or excluding a bidet, an emergency floor drain or both. Such fixtures are located together on the same floor level.
2006 International Building Code
IBC, 1203.4.2.1 Bathrooms.
Rooms containing bathtubs, showers, spas and similar bathing fixtures shall be mechanically ventilated in accordance with the International Mechanical Code.
{See Chapter 15, SECTION M1507 MECHANICAL VENTILATION, M1507.1 General. located above}
2006, ICC Performance Code for Buildings and Facilities
Chapter 9 Moisture, Section 903 Internal Moisture
903.3 Performance requirements.
903.3.1 Excess moisture removal and protection.
An adequate means shall be provided to remove excess moisture or protect the structure from the effects of excess moisture and condensation to all habitable spaces, bathrooms, laundries and other locations where moisture may be generated.
So Frank, do you have information on this subject
Hope you have been well see ya in canada.
Is that an apology Frank? 