Conversion Data

Length Metric to Imperial Imperial to Metric
mm x 0.394 = ins ins x 25.4 = MM
m x 3.281 = feet feet x 0.3048 = m
m x 1.094 = yards yards x 0.9144 = m
km x 0.6214 miles x 1.609 = km
Area
cm² x 0.155 = sq ins sq ins. X 6.452 = cm²
m² x 10.76 = sq ft sq ft x 0.929 = m²
m² x 1.196 = sq yards sq yards x 0.8361 = m²
km² x 0.386 = sq miles acres x 0.4047 = hectare
Volume
cm³ x 0.061 = cu ins cu ins x 16.39 = cm³
m³ x 35.32 = cu ft cu ftx 0.283 = m³
m³ x 1.308 = cu yards cu yards x 0.7645 = m³
litres x 1.76 = pints pints x 0.568 = litre = dm³
litres x 0.2205 = gallons gallons x 4.546 = litre – dm³
Flow Rates
Units CFM M³/hr L/min L/Sec
10 CFM 10 17 283.3 4.72
10 M³/hr 17 10 0.6 0.01
30 L/min 0.35 0.6 10 0.17
HP – Watts Inches – mm
1 745.69W 1/16 1.6mm
3/4 559.27W 1/8 3.2mm
5/8 466.06W 1/6 4.8mm
1/2 372.85W 1/4 6.4mm
3/8 279.63W 5/16 7.9mm
1/8 248.56W 3/8 9.5mm
1/4 186.42W 7/16 11.1mm
1/6 124.28W 1/2 12.7mm
1/8 93.21W 9/16 14.3mm
1/16  46.61W 5/8 15.9mm
11/18 17.5mm
3/4 19.1mm
13/16 20.6mm
7/8 22.2mm
15/16 23.8mm

Approximate Power Outputs

1PH PSC Motors

Amps Watts out Watts in Poles
0.50 35 110(2MF) 4
0.65 50 145(2.5MF) 4
0.75 75 165(2.5MF) 4
1.00 100 180(2.5MF) 4
1.20 150 280(2MF) 4
1.40 180 310(2MF) 4
1.60 210 350(2MF) 4
2.10 250 230(2MF) 6
3.00 370 600(2MF) 6
3.60 550 990(2MF) 6
5.10 735 1200(2MF) 6

Shaded Pole Motors

Amps Watts inc Stack
0.20 32 13.5mm
0.21 35 20mm
0.23 38 21mm
0.45 65 25mm
0.52 73 30mm
0.68 95 40mm
0.87 210 45mm

NEMA Insulated Classes

Insulation Rating Max Operation Temp ⁰C & ⁰F
A 105⁰C 221⁰F
B 130⁰C 266⁰F
F 155⁰C 311⁰F
H 180⁰C 356⁰F

Choosing the Correct Fan

In order to select the correct fan please find below recommended air changes per hour in normal conditions for the following buildings:

Banks 2-4 Launderettes 24-40
Bars/Cafes 10-12 Living Rooms 4-6
Pool Games Rooms 6-8 Hospitals 5-7
Classrooms 2-4 Offices 5-7
Conference Rooms 8-10 Restaurants 10-15
Dark Rooms/X-ray 10-15 Shops/Supermarkets 4-6
Fish & Chip Shops 25-40 Swimming Pools 25-30
Kitchens (domestic) 10-15 Toilet/Bathrooms 10-15
Laboratories 5-10 Canteen 6-10