|
Recommended values for air changes (NBC-5.2.2.1) & CPWD |
|
| Application | Air Change per Hour |
| Assembly rooms | 4 to 8 |
| Bakeries | 20 to 30 |
| Banks/building societies | 4 to 8 |
| Bathrooms | 6 to 10 |
| Bedrooms | 2 to 4 |
| Billiard rooms | 6 to 8 |
| Cafes and coffee bars | 10 to 12 |
| Canteens | 8 to 12 |
| Cellars | 3 to 10 |
| Changing rooms | 6 to 10 |
| Churches | 1 to 3 |
| Cinemas and theatres | 10 to 15 |
| Club rooms 12, Min | 12 to 15 |
| Compressor rooms | 10 to 12 |
| Conference rooms | 8 to 12 |
| Corridors | 5 to 10 |
| Dairies | 8 to 12 |
| Dance halls | 12 |
| Dye works | 20 to 30 |
| Electroplating shops | 10 to 12 |
| Entrance halls | 3 to 5 |
| Factories and work shops | 8 to 10 |
| Foundries | 15 to 30 |
| Garages | 6 to 8 |
| Glass houses | 25 to 60 |
| Gymnasium | 6 |
| Hair dressing saloon | 10 to 15 |
| Hospitals sterilizing | 15 to 20 |
| Hospital wards | 6 to 8 |
| Hospital domestic | 15 to 20 |
| Laboratories | 6 to 15 |
| Launderettes | 10 to 15 |
| Laundries | 10 to 30 |
| Lavatories | 6 to 15 |
| Lecture theatres | 5 to 8 |
| Libraries | 3 to 5 |
| Lift cars | 20 |
| Living rooms | 3 to 6 |
| Mushroom houses | 6 to 10 |
| Offices | 6 to 10 |
| Paint shops (not cellulose) | 10 to 20 |
| Photo and X-ray dark room | 10 to 15 |
| Public house bars | 12 |
| Recording control rooms | 15 to 25 |
| Recording studios | 10 to 12 |
| Restaurants | 8 to 12 |
| Schoolrooms | 5 to 7 |
| Shops and supermarkets | 8 to 15 |
| Shower baths | 15 to 20 |
| Stores and warehouses | 3 to 6 |
| STP rooms | 30 |
| Squash courts | 4 |
| Swimming baths | 10 to 15 |
| Toilets | 6 to 10 |
| Underground vehicle parking | 6 |
| Utility rooms | 15 to 30 |
| Welding shops | 15 to 30 |
| Note: The ventilation rates may be increased by 50 % where heavy smoking occurs or if the room is below the ground. | |
|
Recommended values for air changes |
|
| Application | Air Change per Minute |
| Assembly Hall | 7 |
| Auditorium | 10 |
| Barber Shop | 6 |
| Basement | 8 |
| Battery Room | 4 |
| Boiler Room | 1 |
| Bowling Alley | 5 |
| Engine Room | 6 |
| Gymnasium | 8 |
| Projection Booth | 2 |
| Church | 15 |
| Factory | 6 |
| Laundry | 2 |
| Summer Cooling | 1 |
| Classroom | 6 |
| Forge Room | 3 |
| Locker Room | 3 |
| Toilet | 3 |
| Dance Hall | 5 |
| Foundry | 4 |
| Machine Shop | 8 |
| Transformer Room | 1 |
| Department Store | 6 |
| Garage | 5 |
| Plating Room | 3 |
| Warehouse | 12 |
| Dry Cleaning | 5 |
| General Office | 10 |
| Pressing Room | 1 |
| Welding Shop | 2 |
|
TYPE A CEILING FANS (IS-374) |
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| FAN SIZE | AIR DELIVERY (m3/min) | MAXIMUM INPUT  |
| 900 | 140 | 42 |
| 1050 | 165 | 48 |
| 1200 | 215 | 50 |
| 1400 | 270 | 60 |
| 1500 | 300 | 63 |
|
Size of Ceiling Fan |
|
| Area | Suggested Fan Size |
| Up to 9 Square Meters | 900mm (36″) |
| Up to 12 Square Meters | 1067mm (42″) |
| Up to 18 Square Meters | 1200mm (48″) |
| Up to 30 Square Meters | 1300mm (52″) |
| Up to 40 Square Meters | 1400mm (56″) |
|
Size and Number of Ceiling Fans for Rooms (As per NBC Table-10) |
|||||||||||
| Room Width | Room Length | ||||||||||
| Fan Size (mm) /No of Fan | |||||||||||
| 4 Meter | 5 Meter | 6 Meter | 7 Meter | 8 Meter | 9 Meter | 10 Meter | 11 Meter | 12 Meter | 14 Meter | 16 Meter | |
| 3 Meter | 1200/1 | 1400/1 | 1500/1 | 1050/2 | 1200/2 | 1400/2 | 1400/2 | 1400/2 | 1200/3 | 1400/3 | 1400/3 |
| 4 Meter | 1200/1 | 1400/1 | 1200/2 | 1200/2 | 1200/2 | 1400/2 | 1400/2 | 1500/2 | 1200/3 | 1400/3 | 1500/3 |
| 5 Meter | 1400/1 | 1400/1 | 1400/2 | 1400/2 | 1400/2 | 1400/2 | 1400/2 | 1500/2 | 1400/3 | 1400/3 | 1500/3 |
| 6 Meter | 1200/2 | 1400/2 | 900/4 | 1050/4 | 1200/4 | 1400/4 | 1400/4 | 1500/4 | 1200/6 | 1400/6 | 1500/6 |
| 7 Meter | 1200/2 | 1400/2 | 1050/4 | 1050/4 | 1200/4 | 1400/4 | 1400/4 | 1500/4 | 1200/6 | 1400/6 | 1500/6 |
| 8 Meter | 1200/2 | 1400/2 | 1200/4 | 1200/4 | 1200/4 | 1400/4 | 1400/4 | 1500/4 | 1200/6 | 1400/6 | 1500/6 |
| 9 Meter | 1400/2 | 1400/2 | 1400/4 | 1400/4 | 1400/4 | 1400/4 | 1400/4 | 1500/4 | 1400/6 | 1400/6 | 1500/6 |
| 10 Meter | 1400/2 | 1400/2 | 1400/4 | 1400/4 | 1400/4 | 1400/4 | 1400/4 | 1500/4 | 1400/6 | 1400/6 | 1500/6 |
| 11 Meter | 1500/2 | 1500/2 | 1500/4 | 1500/4 | 1500/4 | 1500/4 | 1500/4 | 1500/4 | 1500/6 | 1500/6 | 1500/6 |
| 12 Meter | 1200/3 | 1400/3 | 1200/6 | 1200/6 | 1200/6 | 1400/6 | 1400/6 | 1500/6 | 1200/7 | 1400/9 | 1400/9 |
| 13 Meter | 1400/3 | 1400/3 | 1200/6 | 1200/6 | 1200/6 | 1400/6 | 1400/6 | 1500/6 | 1400/9 | 1400/9 | 1500/9 |
| 14 Meter | 1400/3 | 1400/3 | 1400/6 | 1400/6 | 1400/6 | 1400/6 | 1400/6 | 1500/6 | 1400/9 | 1400/9 | 1500/9 |
|
Ceiling Fan Criteria (As per NBC) |
|
| Capacity of a ceiling fan | =55D m3/min ,D= the longer dimension of a room |
| Height of fan blades above the floor | = (3H + W)/4, where H is the height of the room, W is the height of work plane. |
| Minimum distance between fan blades and the ceiling | =0.3 m. |
|
Size Your Fan for the Room (ENERGY STAR) |
|
| Room Size | Fan Size |
| Up to 75 sq. ft. | 29 To 36 inches or smaller |
| 75 to 144 sq. ft. | 36 to 42 inches |
| 144 to 225 sq. ft. | 44 to 50 inches |
| 225 to 400 sq. ft. | 50 to 54 inches |
| Over 400 Sq. ft | 54 To 72 inches multiple fans installed |
|
Minimum Efficacy Levels of Ceiling Fans (ENERGY STAR ) |
|
| Airflow (CFM) | Minimum Efficacy Level (CFM/W) |
| Low | At low speed, airflow of 1250 CFM and an efficiency of 155 cfm/W. |
| Medium | At medium speed, airflow of 3000 CFM and an efficiency of 100 cfm/W. |
| High | At high speed, airflow of 5000 CFM and an efficiency of 75 cfm/W. |
|
Ceiling Fan Rod Extend Length |
|
| Ceiling Height | Pole Length |
| 8 Feet | No Down rod |
| 9 Feet | 6 Inches |
| 10 Feet | 12 Inches |
| 11 Feet | 18 Inches |
| 12 Feet | 24 Inches |
| 13 Feet | 36 Inches |
| 14 Feet | 48 Inches |
| 15 Feet | 60 Inches |
| 20 Feet or greater | 72 Inches |
|
Ceiling Fan Height Chart |
|
| Ceiling Height | Distance |
| < 8 Feet | Choose a low-profile ceiling fan. 18″ Minimum distance blade to wall. 7′ minimum distance blade to floor. |
| > 9 Feet | Choose a ceiling fan down rod. 18″ Minimum distance blade to wall. |
|
Distance between Two Fans |
|
| Fan Size | Distance |
| 36″ (900mm) | 1.8 Meter |
| 42″ (1000mm) | 2 Meter |
| 48″ (1200mm) | 2.5 Meter |
| 56″ (1400mm) | 3 Meter |
|
Fan Blade Pitch Angle and No of Blade |
|
| Fan Blade pitch | It is the angle of fan’s blades (measured in degrees) and it is in conjunction with the fan motor, |
| It is show how well fan is able to circulate air. | |
| Higher blade pitches typically move more air in cubic feet per minute, or CFM. | |
| The optimal blade pitch for a ceiling fan is between 12 and 15 degrees. | |
| Blade number | It can contribute to the amount of air movement as well. |
| The typical ceiling fan comes standard with 4 or 5 blades. | |
| Fans with more blades are usually quieter but also move less air. | |
|
Ceiling Fan Size Guide |
|||
| Room Size | Room Type | Blade Span | CFM Rating |
| Up to 100 Sq. Ft | Bathroom, Breakfast Nooks, Utility Rooms, Small Bedrooms, Porches | 29” To 36″ (700 to 900mm) | |
| 100 To 144 Sq. Ft | Bathroom, Breakfast Nooks, Utility Rooms, Small Bedrooms, Porches | 36” To 42″ (700 to 1000mm) | 1,000 To 3,000 |
| 100 To 225 Sq. Ft | Medium Bedrooms, Kitchens, Dining Rooms, Dens, Patios | 44” To 50″ (1200 to 1270mm) | 1,600 To 4,500 |
| 225 To 400 Sq. Ft | Master Bedrooms, Family Rooms, TV Rooms, Small Garages, Gazebos | Over 50” (1270mm) | 2,300 To 6,500 |
| Over 400 Sq. Ft | Great Rooms, Large Garages, Basements, and Open Floor Plans | Over 62” (1600mm) | 5,500 To 13,500 |
|
Ceiling Fan Size |
|
| Room Size | Fan Blade Sweep |
| < 90 Sq.Foot | 15″ to 42″ (400 to 1000mm) |
| 90 to 100 Sq.Foot | 44″ to 46″ (1000 to 1200mm) |
| 100 to 150 Sq.Foot | 52″ to 54″ (1300 to 1400mm) |
| > 150 Sq.Foot | 56″ to 70″ (1400 to 1800mm) |
|
Ceiling Fan Speed and RPM |
||||
| Speed | Watt | RPM | Air Flow (M3/Hr) | Efficiency (M3/Hr/Watt) |
| Low | 62.3 | 171 | 8736 | 140 |
| Medium | 34.9 | 130 | 6774 | 197 |
| High | 15.2 | 86 | 4066 | 267 |
|
Various distance of Ceiling Fan in Room |
|
| Ceiling Fan Blades and Floor | 7 ft |
| Ceiling Fan Blades and Ceiling | 8 to 10 inches |
| Ceiling Fan Blades and Light fixtures. | 39 inches |
| Ceiling Fan Blades and Wall | 18 inches |
|
Minimum Efficacy Levels of Ceiling Fans (ENERGY STAR ) |
||
| Speed | Air Flow | Efficiency (CFM/Watt) |
| At low speed | 1250 CFM | 155 cfm/W |
| At medium speed | 3000 CFM | 100 cfm/W |
| At high speed | 5000 CFM | 75 cfm/W |
|
Size of Rod / Cord for Hanging Light (As per NBC) |
|
| Nominal Cross-Sectional Area of Twin Cord mm for Hanging Light | Maximum Permissible Weight mm2 kg |
| 0.5 | 2 |
| 0.75 | 3 |
| 1 | 5 |
| 1.5 | 5.3 |
| 2.5 | 8.8 |
| 4 | 14 |
|
Standard Exhaust Fan Size |
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| Fan DIA (MM / inches) | Speed (RPM) | Input Power |
Phase | Current (A) | M3/HR (CFH) | M3/MI (CFM) | Sound level dB |
| 150/6″ | 1200 | 24 | Single | 0.1 | 270 | 5 | 44 To 50 |
| 200/8″ | 1350 | 28 | Single | 0.12 | 500 | 8 | 44 To 50 |
| 250/10″ | 1350 | 36 | Single | 0.15 | 800 | 13 | 44 To 50 |
| 305/12″ | 1400 | 50 | Single | 0.4 | 1710 | 29 | 50 To 55 |
| 305/12″ | 900 | 50 | Single | 0.21 | 1145 | 19 | 35 To 40 |
| 380/15″ | 1400 | 160 | Single | 0.75 | 3250 | 54 | 60 To 65 |
| 380/15″ | 1400 | 150 | Three | 0.45 | 3250 | 54 | 60 To 65 |
| 380/15″ | 900 | 90 | Single | 0.4 | 2000 | 33 | 50 To 55 |
| 380/15″ | 900 | 100 | Three | 0.29 | 2000 | 33 | 50 To 55 |
| 457/18″ | 1400 | 410 | Single | 1.7 | 6120 | 102 | 65 To 70 |
| 457/18″ | 1400 | 410 | Three | 0.65 | 6120 | 102 | 65 To 70 |
| 457/18″ | 900 | 150 | Single | 0.65 | 3900 | 65 | 55 To 60 |
| 457/18″ | 900 | 150 | Three | 0.3 | 3900 | 65 | 55 To 60 |
| 610/24″ | 700 | 240 | Single | 0.4 | 7100 | 118 | 55 To 60 |
| 610/24″ | 900 | 500 | Three | 0.5 | 7100 | 118 | 55 To 60 |
| 610/24″ | 900 | 500 | Single | 2.6 | 9400 | 157 | 60 To 65 |
| 610/24″ | 900 | 500 | Three | 0.85 | 9400 | 157 | 60 To 65 |
| 750/30″ | 900 | 870 | Single | 3.8 | 12000 | 200 | 70 To 75 |
| 750/30″ | 900 | 910 | Three | 1.8 | 12000 | 200 | 70 To 75 |
| 900/36″ | 700 | 1200 | Three | 2.4 | 28100 | 468 | 75 To 80 |
View more at https://electricalnotes.wordpress.com/2019/11/02/electrical-thumb-rules-ventilation-ceiling-fan/.
Published by Department of EEE, ADBU: tinyurl.com/eee-adbu
