. House is "L" Shaped , Matchbox Style Bungalow.. A Deck inside the "L" ... Bathroom (12'X 7') 2 walls are Outside walls ,(12' side along Deck).. There is 2 Frosted Windows , 1 Fixed along the 12' side (Deck) The 1 needing replacement is on the 7' side .. Vinyle Siding.. House built in the early 70's , I believe we're 3rd Owners..lol...
Thanks again;
Openable widows in bathrooms are often considered sufficient, however, you have to remember to close that damn window, while an exhaust fan can be switched from a timer.
Up through the roof is, aesthetically, the least offensive.
Here is the 2012 IRC'S take;
International Residential Code (IRC) 2012
Chapter 15 - Exhaust Systems
SECTION M1501 GENERAL
M1501.1 Outdoor discharge. The air removed by every mechanical exhaust system shall be discharged to the outdoors in accordance with Section M1506.2. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
Exception: Whole-house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics shall be permitted.
SECTION M1506 EXHAUST DUCTS AND EXHAUST OPENINGS
M1506.2 Exhaust openings. Air exhaust openings shall terminate not less than 3 feet (914 mm) from property lines; 3 feet (914 mm) from operable and nonoperable openings into the building and 10 feet (3048 mm) from mechanical air intakes except where the opening is located 3 feet (914 mm) above the air intake. Openings shall comply with Sections R303.5.2 and R303.6.
Chapter 3 - Building Planning
SECTION R303 LIGHT, VENTILATION AND HEATING
R303.5.2 Exhaust openings. Exhaust air shall not be directed onto walkways.
R303.6 Outside opening protection. Air exhaust and intake openings that terminate outdoors shall be protected with corrosion-resistant screens, louvers or grilles having a minimum opening size of 1/4 inch (6 mm) and a maximum opening size of 1/2 inch (13 mm), in any dimension. Openings shall be protected against local weather conditions. Outdoor air exhaust and intake openings shall meet the provisions for exterior wall opening protectives in accordance with this code.