Thumb Rules-VENTILATION & CEILING FAN

THUMB RULES-VENTILATION & CEILING FAN

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)

FAN SIZE AIR DELIVERY (m3/min) MAXIMUM INPUT (W) 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 ce…