Thumb Rules-VENTILATION & CEILING FAN
November 2, 2019 11 Comments
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Recommended values for air changes (NBC-5.2.2.1) & CPWD |
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| 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. | |
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Recommended values for air changes |
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| 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 |
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TYPE A CEILING FANS (IS-374) |
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| FAN SIZE | AIR DELIVERY (m3/min) | MAXIMUM INPUT (W) |
| 900 | 140 | 42 |
| 1050 | 165 | 48 |
| 1200 | 215 | 50 |
| 1400 | 270 | 60 |
| 1500 | 300 | 63 |
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Size of Ceiling Fan |
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| 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″) |
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Size and Number of Ceiling Fans for Rooms (As per NBC Table-10) |
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| 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 |
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Ceiling Fan Criteria (As per NBC) |
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| 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. |
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Size Your Fan for the Room (ENERGY STAR) |
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| 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 |
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Minimum Efficacy Levels of Ceiling Fans (ENERGY STAR ) |
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| 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. |
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Ceiling Fan Rod Extend Length |
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| 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 |
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Ceiling Fan Height Chart |
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| 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. |
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Distance between Two Fans |
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| Fan Size | Distance |
| 36″ (900mm) | 1.8 Meter |
| 42″ (1000mm) | 2 Meter |
| 48″ (1200mm) | 2.5 Meter |
| 56″ (1400mm) | 3 Meter |
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Fan Blade Pitch Angle and No of Blade |
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| 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. | |
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Ceiling Fan Size Guide |
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| 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 |
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Ceiling Fan Size |
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| 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) |
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Ceiling Fan Speed and RPM |
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| 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 |
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Various distance of Ceiling Fan in Room |
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| 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 |
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Minimum Efficacy Levels of Ceiling Fans (ENERGY STAR ) |
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| 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 |
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Size of Rod / Cord for Hanging Light (As per NBC) |
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| 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 |
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Standard Exhaust Fan Size |
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| Fan DIA (MM / inches) | Speed (RPM) | Input Power (W) | 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 |
JIGNESH PARMAR
Dear Mr. Parmar,
First of all I wish to thank you for all your great efforts you have been putting all these years to publish so much useful information. This info on fans is of great use to many.
However there seems to be some issue with the following section – “Ceiling Fan Speed and RPM” under low speed you have placed higher rpm and vice-versa. Pls. confirm.
Best regards
Shishir Dutt
Associate Professor
Tolani Maritime Institute
Pune
Thanks…………..@Jignesh.Parmar
Mr Jignesh ji,
Good Morning!
I am really thankful to your kind honour for utilizing your notes. I am making a dictionary of your notes for the students I teach sometimes in Marine Academies as visiting faculty. I did my Engineering in 1985 from Indian Naval Ship Valsura [Naval Engineering Institute] – Electrical Base, Jamnagar.
Regards,
Dr Mukesh Kumar
Hi Sir, I would like to get in touch to discuss the blog written by you and an association for long term. Please get in touch with me over email – ankita.l@axis-india.com
THANK YOU SIR
Dear Jigneshji, Good information on Ventilation and Cieling Fan. I have one question on Short Ckt MVA Rating of Substation. How to calculate MVA Short CKT Rating at Input of a Substation which is receiving power form another substation. Please clarify? Thanks! Regards, Nishchal Chowdhay 9406600319
On Sat, 2 Nov 2019 at 08:02, Electrical Notes & Articles wrote:
> Jignesh.Parmar posted: ” 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 ” >
Dear Jigneshji,
Good information on Ventilation and Cieling Fan.
I have one question on Short Ckt MVA Rating of Substation.
How to calculate MVA Short CKT Rating at Input of a Substation which is receiving power form another substation.
Please clarify?
Thanks!
Regards,
Nishchal Chowdhay
9406600319
tanks, your information
Thanks
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On Sat, 2 Nov, 2019, 08:02 Electrical Notes & Articles, wrote:
> Jignesh.Parmar posted: ” 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 ” >
can you please give me the NBC code number regarding ceiling fan number and size so that i can use it as a reference. my email is: adeel.ahmad7@yahoo.com