OCEANWP THEME BY NICK

When installing a gas water heater, with an 18 ft. high chimney vent, should you select the 15 Ft. or 20 Ft. row, on the vent sizing charts? HELP... If R-19 insulation is added to a ceiling with a U-value of .05, what is the new R-value? New U-value? HELP... Students who have used this guide book have a higher passing rate than students who take a classroom course. WHY? Because people who READ the material retain much more than people whom are TOLD the material, and the Guide is always next to them as a reference to refer to later.