- Section 304.1 Says to assume metal louvers have 75% free area. A 6” x 12’ louver is 72 sq. inches

72/.75 = **96 sq. inches.** The louver must be 96 sq. inches if it is to have 72 sq. inches of free area

2. Read section 403.3.1.1 then go to Table 403.3.1.1. The Table says there will be 5 occupants per 1000 sq. ft. 1700 divided by 1000 = 17 . 5 x 17 = 85 occupants. Furthermore, the Table says we need 5 cfm outdoor air per occupant, thus 85 occupants x 5 cfm = **425 total cfm must be introduced into the office.**

3. Table 504.2(1) The vent is 12’ high, use the 10’ row, as you must use the shorter length. Follow the 2 foot lateral row to the 4 inch column. Under the MAX column, A 10 foot high vent with 2 foot lateral will handle up t0 198,000 btuh. A 3 inch vent will only handle 118,000 bthu. **Select a 4 inch vent**

4. Read section 403.3.1.1 then go to Table 403.3.1.1. The Table says there will be 5 occupants per 1000 sq. ft. 1700 divided by 1000 = 17 . 5 x 17 = 85 occupants. Furthermore, the Table says we need 5 cfm outdoor air per occupant, thus 85 occupants x 5 cfm = **425 total cfm must be introduced into the office.**

5. The U value of the existing insulation is .05. Therefore the existing R value is 20 (1/.05), **20 +19 = 39 new R value; 1/39 = .025 new U value**

** Heat loss = Area X U X TD 1200 sq. ft. X .025 X 50 = 1500 btuh heat loss**

** 6. **I’m not going to go into a lot of detail about calculating sales price at various profit margins, as the rationale is discussed in greater detail in my prep course.

To calculate the sales price according to standard accounting principles, (1) start with 100%, (2) deduct the profit you wish to obtain (3) divide your cost by the resulting percent

**1.00 – .30 = .70, $1000/.70 = $1428.57 sales price**