1. Where the minimum size combustion air duct is 6” X 12”, a metal lover with unknown free area, must be at least _______ square inches
2. Calculate the required outdoor ventilation rate for a 1700 sq. ft. office space?
3. When installing B-vent for a 120,000 BTUH gas furnace (fan assisted), what is the minimum diameter if the vent is 12 feet high with a 2 foot lateral?
4. Calculate the velocity (FPM) of 800 CFM in an 8″ x 14″ duct.
5. If R-19 insulation is added to a 1200 square foot ceiling with a U-value of .05, what is the new R-value? New U-value? Heat loss at 50 degree temperature difference?
6. If you purchase an appliance for $1000 and wish to make 30% profit; what would your selling price be? Hint: the answer is not $130