### CALCULATION

Determine the quantity of Wind Driven Ventilators required to ventilate a specific building effectively.

### STEP 1

Calculate the volume of the building

### STEP 2

Select the Air Rate Change required for your specific building

Air rate changes per hour is the volume of air that needs to be replaced with fresh air every hour.
Select the air rate change required for your specific building indicated in the Table - A : Recommended Air Rate Change per Hour (ACH). [Refer to ACH table below Step 4]
e.g. Assembly Hall : 06 - 12 air changes required.
Average Air Rate Changes per Hour = 09 (approximate)

### STEP 3

Multiply the Volume (step 1) by the Number of Air Changes required (step 2)

### STEP 4

Determine the Size and Quantity of Wind Driven Ventilators required for the above building

Total Volume of Air (step 3) divided by the extraction capacity of the specific Wind Driven Ventilator.

Select Wind Ventilator Size & enter CFM value

Total Unit of Wind Ventilator required for building :

### Table - A : Recommended Air Changes Rates per Hour Table

 Typing of building Air change per hour Typing of Building Air change per hour Assembly Hall 6-12 Factories(Heavy) 10-30 Auditorium 4-12 Laundry 12-30 Bakeries 12-20 Paper Mill 8-30 Boiler Room 15-60 Textile Mills 4-12 Brewery 8-30 Packing Room 8-30 Class Room 10-15 Transformer Room 12-30 Engine Room 12-30 Paint Shops 10-30 Factories(Light) 6-12 Warehouse 4-6

### Table - B : Performance Data

 Wind Velocity(MPH) 5 8 10 Temp. Diff. °C 3 5 10 3 5 10 3 5 10 Model No. Throat size (inc) Stack height Exhaust Capacity in CFM Wind Ventilator 18 10 805 860 945 1230 1285 1375 1535 1590 1680 20 860 930 1045 1290 1355 1470 1595 1660 1775 30 910 990 1130 1335 1415 1555 1645 1725 1930 40 950 1045 1200 1375 1470 1625 1680 1775 1930 Wind Ventilator 21 10 939 1000 1102 1436 1498 1600 1792 1854 1958 20 1005 1084 1216 1503 1582 1714 1859 1938 2070 30 1058 1154 1314 1556 1652 1812 1915 2010 2168 40 1107 1216 1398 1605 1714 1896 1961 2070 2252 Wind Ventilator 24 10 1075 1140 1260 1640 1710 1830 2048 2120 2240 20 1150 1240 1390 1720 1810 1960 2125 2215 2365 30 1210 1320 1500 1780 1890 2070 2190 2300 2480 40 1265 1390 1600 1835 1960 2165 2240 2365 2575
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